The Chinese authorities have ordered the evacuation of residents within a 3km radius of the Tianjin blast site over fears of chemical contamination.

The evacuations came after an apparent change in wind direction, and 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 in the giant blasts in the north-east Chinese port on Wednesday.

People sheltering at a school used as a safe haven since the disaster have been asked to leave wearing masks and long trousers, reports say.

Read the article “China Tianjin Blasts: Evacuations as Sodium Cyanide Found” on bbc.com.