Washington - Officials investigating accusations that two Secret Service agents struck a White House barricade after a night of drinking last week have surveillance video showing the agents' government-issued car rolling into an area that had been cordoned off because of a suspicious package, according to two people briefed on the inquiry. The video shows the car traveling at low speed under police tape that had been put up around the package and nudging a large orange barricade, which did not fall over, these people said.