The investigative news organization ProPublica is reporting a series of internal BP investigations over the past decade warned senior BP managers that the oil company repeatedly disregarded safety and environmental rules and risked a serious accident if it did not change its ways. The reports described instances in which management flouted safety by neglecting aging equipment, pressured employees not to report problems and cut short or delayed inspections to reduce production costs. A 2001 internal report noted that BP had neglected key equipment needed for an emergency shutdown, including safety shutoff valves and gas and fire detectors similar to those that could have helped prevent the fire and explosion on the Deepwater Horizon rig in the Gulf.