A fireman wearing a gas mask searching the site of the giant chemical explosions in the Chinese port city of Tianjin. Police confirmed for the first time yesterday that there was highly-poisonous sodium cyanide chemical at the site of the warehouse blasts on Wednesday that have killed 104 people so far. A series of new, small explosions were heard in the vicinity yesterday. Small fires also broke out in the area, sending thick plumes of black smoke into the air. These immediately led to evacuations within a 3km radius over fears surrounding the chemical, which is fatal when ingested or inhaled.