China Tianjin blasts: Man found alive 50 metres from explosion centre

Chinese television has shown images of a man they say was discovered alive on Saturday, about 50 metres from the centre of a blast that devastated an industrial facility and its surroundings on Wednesday.

It comes as authorities have ordered the evacuation of people living within a 3km radius of the Tianjin blast site, over fears of contamination.

The BBC's Jo Floto explains.