Federal investigators said three fuel-sealing gaskets were missing from a tanker-truck that plowed into a car, killing five people.

Had the gaskets been on three of five so-called manhole covers on the tank - loaded with 4,000 gallons of fuel - 1,400 gallons of gas probably would not have gushed from the vehicle, Frank Ghiorsi, regional director for the National Transportation Safety Board, said Tuesday.The investigation of the cause of the crash continued Wednesday as police worked to confirm the tentative identifications of four of the five collision victims.