The authorities in China have ordered anyone living within a three kilometre radius of a massive explosion at a chemical plant to leave their homes<br /><br /> The official news agency Xinhua says it is over fears that chemical contamination is spreading. The explosion was so big it was visible from space.*<br /><br /> The team from the Chinese military are checking for toxic gases in the surrounding area in the north-eastern port city of Tianjin.<br /><br /> Tianjin : le bilan s’alourdit, les habitants de la zone des explosions évacués<br />http://t.co/XYanXIXBRD<br />Le Monde— info75 (@encolere75) 15 Août 2015<br /> <br /><br /> What caused the explosion?<br /><br /> Officials quoted by the state news agency Xinhua say they are still not sure what caused the explosion, which was the equivalent of 24 tonnes of TNT exploding.<br /><br /> They say the extent of the damage makes it hard to identify which materials may have been present.<br /><br /> The government has ordered more stringent checks on dangerous chemicals nationwide.<br /><br /> Death toll mounts<br /><br /> It is now know
