Protests kick off for second day ahead of G20 summit

Hamburg, Germany (CNN)Demonstrators are attempting to storm police barriers in the German city of Hamburg just hours before world leaders are set to gather for this year's G20 summit, protest leaders told CNN.

The latest round of demonstrations comes after a violent night in which dozens of police officers were hurt and water cannons were deployed.

The unrest appeared to continue early Friday as small groups of protesters tried to march down streets to be used by G20 delegates.

Volunteers could be seen treating people with saline solution, possibly due to tear gas or pepper spray, and tending to other wounded.

One woman could be seen bleeding from her neck.

Police have fired pepper spray, w at least one demonstrator w a head injury at demo against g20 this am pic.twitter.com/4qdjvFrB2A

— Kara Fox (@karadaniellefox) July 7, 2017

Police told demonstrators they were in an area that was forbidden.

Security is tight in the city of 1.8 million, as leaders from around the world convene for the G20 meeting.

The Group of 20, which includes 19 countries and the European Union, accounts for approximately 80% of global GDP. Around two-thirds of the world's population live in a G20 country.

During the two-day meeting in German Chancellor Angela Merkel's birthplace, leaders are expected to discuss climate change, terrorism and migration.

Police gather at Hamburg harbor before the anti-G20 protest march.

Photos: G20 protesters clash with police in Hamburg

Police gather at Hamburg harbor before the anti-G20 protest march.

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Riot police use a water cannon on demonstrators.

Photos: G20 protesters clash with police in Hamburg

Riot police use a water cannon on demonstrators.

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Protesters march during the rally.

Photos: G20 protesters clash with police in Hamburg

Protesters march during the rally.

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Protesters clash with riot police. The protest escalated throughout the day and evening.

Photos: G20 protesters clash with police in Hamburg

Protesters clash with riot police. The protest escalated throughout the day and evening.

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Police attempt to clear the street while using water cannons and pepper spray on demonstrators.

Photos: G20 protesters clash with police in Hamburg

Police attempt to clear the street while using water cannons and pepper spray on demonstrators.

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A woman wearing a sign depicting the G20 summit world leaders blows bubbles at Hamburg harbor before the protest march.

Photos: G20 protesters clash with police in Hamburg

A woman wearing a sign depicting the G20 summit world leaders blows bubbles at Hamburg harbor before the protest march.

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Participants in the protest. Police said one person had been arrested by late Thursday night.

Photos: G20 protesters clash with police in Hamburg

Participants in the protest. Police said one person had been arrested by late Thursday night.

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A banner on a bridge reads "President Macri, Don't sell our Argentina." Officials said at least 76 police officers were hurt.

Photos: G20 protesters clash with police in Hamburg

A banner on a bridge reads "President Macri, Don't sell our Argentina." Officials said at least 76 police officers were hurt.

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Officials said the originally peaceful protest became violent, with firecrackers and bottles being thrown at riot police.

Photos: G20 protesters clash with police in Hamburg

Officials said the originally peaceful protest became violent, with firecrackers and bottles being thrown at riot police.

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Riot police walk down a road during the Welcome to Hell protest march on Thursday, July 6,  in Hamburg, Germany. Protesters clashed with authorities throughout the day while world leaders arrived for the G20 economic summit. The leaders of the group of 20 meet July 7 and July 8.

Photos: G20 protesters clash with police in Hamburg

Riot police walk down a road during the Welcome to Hell protest march on Thursday, July 6, in Hamburg, Germany. Protesters clashed with authorities throughout the day while world leaders arrived for the G20 economic summit. The leaders of the group of 20 meet July 7 and July 8.

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Protesters erect burning barricades in front of the Rote Flora left-wing center.

Photos: G20 protesters clash with police in Hamburg

Protesters erect burning barricades in front of the Rote Flora left-wing center.

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Police stand guard in the street while protesters erect barricades.

Photos: G20 protesters clash with police in Hamburg

Police stand guard in the street while protesters erect barricades.

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An officer looks on as burning barricades blaze in front of the Rote Flora left-wing center.

Photos: G20 protesters clash with police in Hamburg

An officer looks on as burning barricades blaze in front of the Rote Flora left-wing center.

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Police stand in front of the Rote Flora left-wing center as debris smolders in the street.

Photos: G20 protesters clash with police in Hamburg

Police stand in front of the Rote Flora left-wing center as debris smolders in the street.

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A demonstrator is sprayed by water canons.

Photos: G20 protesters clash with police in Hamburg

A demonstrator is sprayed by water canons.

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Police and protesters clash during the Welcome to Hell march.

Photos: G20 protesters clash with police in Hamburg

Police and protesters clash during the Welcome to Hell march.

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A man wearing protective goggles moves away from officers trying to clear the streets using water cannons.

Photos: G20 protesters clash with police in Hamburg

A man wearing protective goggles moves away from officers trying to clear the streets using water cannons.

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Police gather at Hamburg harbor before the anti-G20 protest march.

Photos: G20 protesters clash with police in Hamburg

Police gather at Hamburg harbor before the anti-G20 protest march.

Hide Caption

9 of 17

Riot police use a water cannon on demonstrators.

Photos: G20 protesters clash with police in Hamburg

Riot police use a water cannon on demonstrators.

Hide Caption

10 of 17

Protesters march during the rally.

Photos: G20 protesters clash with police in Hamburg

Protesters march during the rally.

Hide Caption

11 of 17

Protesters clash with riot police. The protest escalated throughout the day and evening.

Photos: G20 protesters clash with police in Hamburg

Protesters clash with riot police. The protest escalated throughout the day and evening.

Hide Caption

12 of 17

Police attempt to clear the street while using water cannons and pepper spray on demonstrators.

Photos: G20 protesters clash with police in Hamburg

Police attempt to clear the street while using water cannons and pepper spray on demonstrators.

Hide Caption

13 of 17

A woman wearing a sign depicting the G20 summit world leaders blows bubbles at Hamburg harbor before the protest march.

Photos: G20 protesters clash with police in Hamburg

A woman wearing a sign depicting the G20 summit world leaders blows bubbles at Hamburg harbor before the protest march.

Hide Caption

14 of 17

Participants in the protest. Police said one person had been arrested by late Thursday night.

Photos: G20 protesters clash with police in Hamburg

Participants in the protest. Police said one person had been arrested by late Thursday night.

Hide Caption

15 of 17

A banner on a bridge reads "President Macri, Don't sell our Argentina." Officials said at least 76 police officers were hurt.

Photos: G20 protesters clash with police in Hamburg

A banner on a bridge reads "President Macri, Don't sell our Argentina." Officials said at least 76 police officers were hurt.

Hide Caption

16 of 17

Officials said the originally peaceful protest became violent, with firecrackers and bottles being thrown at riot police.

Photos: G20 protesters clash with police in Hamburg

Officials said the originally peaceful protest became violent, with firecrackers and bottles being thrown at riot police.

Hide Caption

17 of 17

Riot police walk down a road during the Welcome to Hell protest march on Thursday, July 6,  in Hamburg, Germany. Protesters clashed with authorities throughout the day while world leaders arrived for the G20 economic summit. The leaders of the group of 20 meet July 7 and July 8.

Photos: G20 protesters clash with police in Hamburg

Riot police walk down a road during the Welcome to Hell protest march on Thursday, July 6, in Hamburg, Germany. Protesters clashed with authorities throughout the day while world leaders arrived for the G20 economic summit. The leaders of the group of 20 meet July 7 and July 8.

Hide Caption

1 of 17

Protesters erect burning barricades in front of the Rote Flora left-wing center.

Photos: G20 protesters clash with police in Hamburg

Protesters erect burning barricades in front of the Rote Flora left-wing center.

Hide Caption

2 of 17

Police stand guard in the street while protesters erect barricades.

Photos: G20 protesters clash with police in Hamburg

Police stand guard in the street while protesters erect barricades.

Hide Caption

3 of 17

An officer looks on as burning barricades blaze in front of the Rote Flora left-wing center.

Photos: G20 protesters clash with police in Hamburg

An officer looks on as burning barricades blaze in front of the Rote Flora left-wing center.

Hide Caption

4 of 17

Police stand in front of the Rote Flora left-wing center as debris smolders in the street.

Photos: G20 protesters clash with police in Hamburg

Police stand in front of the Rote Flora left-wing center as debris smolders in the street.

Hide Caption

5 of 17

A demonstrator is sprayed by water canons.

Photos: G20 protesters clash with police in Hamburg

A demonstrator is sprayed by water canons.

Hide Caption

6 of 17

Police and protesters clash during the Welcome to Hell march.

Photos: G20 protesters clash with police in Hamburg

Police and protesters clash during the Welcome to Hell march.

Hide Caption

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A man wearing protective goggles moves away from officers trying to clear the streets using water cannons.

Photos: G20 protesters clash with police in Hamburg

A man wearing protective goggles moves away from officers trying to clear the streets using water cannons.

Hide Caption

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Police gather at Hamburg harbor before the anti-G20 protest march.

Photos: G20 protesters clash with police in Hamburg

Police gather at Hamburg harbor before the anti-G20 protest march.

Hide Caption

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Many of the demonstrators who gathered Thursday were protesting against capitalism, but some joined to voice their concern about issues including global warming.

Thursday's protests were marked by violence -- police used water cannons as people threw bottles and smoke bombs during the "Welcome to Hell" march, which began about two miles from where the summit will be held. They were dispersed by midnight, according to police.

German riot police water cannon protestors #G20 pic.twitter.com/WNRvmYfdGF

— Kara Fox (@karadaniellefox) July 6, 2017

At least 76 officers were hurt, including one seriously, Hamburg police said. Authorities did not give the number of injured protesters and bystanders, but said one person had been arrested for throwing a bottle.

News Courtesy: www.cnn.com