China Tianjin blasts: Evacuations as sodium cyanide found
The evacuations came as police confirmed the highly toxic chemical sodium cyanide was found near the site.
A man was found alive 50m from the blast core, Xinhua news agency said.
Eighty-five people are now known to have died and hundreds were hurt in the giant blasts in the north-eastern Chinese port on Wednesday.
Some fires have continued to smoulder and one reignited on Saturday. Xinhua said several cars at the site had "exploded again".
Anti-chemical warfare troops have entered the site, reports say.
The People's Daily newspaper tweeted that they had been sent to handle highly toxic sodium cyanide which had been found there.
The discovery was confirmed by police "roughly east of the blast site" in an industrial zone, state-run Beijing News said.
Source: www.bbc.com