The Chinese authorities have set up a three kilometre exclusion zone around the site of a huge explosion at a chemical warehouse.br br There are fears of a cloud of toxic particles emanating from the site in the north-eastern port city of Tianjin.br br PHOTOS. Tianjin frappée de désolation après les explosions pic.twitter.coma5CrdVX1qy— L'Obs (@LeNouvelObs) 14 Août 2015br br br Last Wednesday’s explosion had the force of 24 tonnes of TNT and was visible from space.br br There are continuing reports of further, smaller blasts.br br At least 85 people are known to have died, including 21 firefighters. br br Officials have confirmed the highly toxic chemical sodium cyanidebr was stored in the warehouse. It can be fatal when ingested or inhaled.br br Locals are being advised to wear long trousers and face masks but the atmosphere is calm:br br A Tianjin, le bilan humain s’alourdit: 85 morts et plus de 700 blessés pic.twitter.