the blowout preventer from the bp oil disaster, you know, the preventer that did not p reve a blowout. it is now in the hands of investigators in new orleans. authorities used a barge to move the 300 ton device along the mississippriver. try to ators will now determine why it failed and allow millions of gallons of oil to spill io the gulf of mexico. want to turn back now to san bruno, california, now, where federal investigators are focusing on a decades old natural gasipe that may have been the root cause of thursday's devastating explosion and fire. four people are confirmed dead, six more now are still unaccounted for. the neighborhood pretty much reduced to rubble. cnn's ted weland rolands has tt on the investigation. >> reporter: surveillance video from inside lanardi's grocery store shows the power of the blast and then chaos. watch closely. at first, people stop what