2 explosions at Brussels airport, reports of several killed

An explosion has occurred at a subway station in Molenbeek, Brussels, according to CNN affiliate RTL. The station is near the European quarter.

[Breaking news update, posted at 4:39 a.m. ET]

All metro stations in Brussels, Belgium, have been closed following a pair of explosions at the city's airport, according to the official Twitter account for the city's transportation agency.

[Previous story, posted at 4:36 a.m. ET]

(CNN) -- Two explosions occurred at the airport in Brussels, Belgium on Tuesday.

Several people were killed, according to the country's public broadcaster, RTBF. Initial reports say up to 10 people were killed and more than 30 people were injured.

Federal police at the airport at Zaventem told CNN that "there has been an explosion" and "something has happened."

Dozens of people have been taken on stretchers out of the airport, according to eyewitnesses.

The Brussels airport tweeted that there have been two blasts and said that "the building" is being evacuated. They also said all airport operations have been suspended and asked those nearby to remain calm.

Anthony Barrett said he heard something at about 8 a.m. local time from his hotel across from the terminal building.

"When I opened the curtains and looked out, I could see people fleeing," he told CNN.

He said he's seen about 19 or 20 stretchers carrying people so far. Luggage trollies were also being used to transport the wounded.

"It's clearly a very serious incident," he said.

It's unclear what caused the blasts, or if they're related to terrorism.

The airport is currently being evacuated and a disaster plan has been initiated, according to CNN affiliate RTL. Passengers have been directed to the runways.

Witnesses told RTL at least one of the two explosions took place in the airport's departure hall.

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The incident comes after Salah Abdeslam, a man who authorities say was involved in the Paris terror attacks last year, was arrested in the Brussels suburb of Molenbeek on Friday.

News Courtesy: www.cnn.com