BP has been heavily criticised by US safety investigators over a refinery disaster that killed 15 workers in 2005. According to the draft report from the US Chemical Safety Board, the blast was the result of lax safety culture at BP...The...company said on Tuesday that it disagreed strongly with parts of the report. According to the draft report, a number of factors contributed to the explosion including cost-cutting, worker fatigue, and a failure by the whole of BP's management to address safety issues...Last month, BP said that...there was "no evidence that anyone acted in bad faith or violated BP's code of conduct"...The Baker report said similar problem existed at all five of BP's US refineries...The US Justice Department is currently investigating whether BP was criminally responsible for the blast...