One of the world’s leading experts on ammonium nitrate told The Daily Telegraph: “It’s only a matter of time before something similar happens again.” Vyto Babrauskas, a fires and explosives forensics expert based in New York, said that there were tens of thousands sites around the world where the chemical was stored unsafely. He carried out an investigation into a disaster seven years ago in West, Texas where 15 died. About 2,750 tonnes ignited to devastate Beirut on Tuesday. In the UK, it is legal to store up to 1,250 tonnes. In the Texas disaster, only 30 tonnes went up.