Toulouse (CNN) – the explosion in a chemical factory in Toulouse four days ago is probably due to negligence and rotten plants in the nitrate store. The public prosecutor’s Office in Toulouse has ruled out an assassination attempt, according to Friday. Chemical processes would have built may be a heat source over the years, which could have led to the earthquake-like explosion, said Prosecutor Michel Bréard. The factory of Serge Biechlin has rejected accusations of “Negligence”. The ammonium nitrate exploded had been stored “under normal conditions”, he said. The belonging to the Group TotalFinaElf chemical factory AZF at the edge of the Southern French town made equal almost to the ground last Friday. At least 29 people died in the catastrophe, 782 people were injured. The insured loss of the disaster should account for up to six billion franc (EUR 1.8 billion mark / 914 million) according to first estimates. 10 000 Apartments, schools, shops and also a hospital in and around Toulouse are destroyed or damaged. Two chemical factories in the vicinity of the AZF have been closed temporarily for fear of further accidents. There is a fuel for the Ariane launcher and the deadly poison gas phosgene for agrochemical products stored. In Bordeaux, a nearly 100-year-old dangerous chemistry factory will be closed and moved. (aa)