april 20th. that explosion, they have now conceded that the number just simply could be much higher. bp is defending its safety record today, the company blames the oil spill on a failed piece of equipment. they still can't say when the leaking well head will be plugged, but brian todd has been following this investigation into the oil rig explosion and spill from venice, louisiana, where the president will end up in venice, what more is being said about how this oil spill occurred and what bp is saying it may be responsible for? >> reporter: they're still saying that blowout preventer is at the core of the cause of this disaster. whether that could have been sealed off or the explosion could have been prevented in the first place of the use of a remote control switch. bp saying we didn't need that remote control switch, these