A woman driver was shot and killed by US police after trying to ram through a White House barricade with a young child in the car.

A woman driving a black Lexus tried to ram through a White House barricade then led police on a chase that ended in gunfire outside the Capitol.

Preliminary tests of a white powder discovered in a US Senate office building in Washington were positive for the potentially deadly poison ricin, police said.

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Washington police have decided that Congressman Gary Condit ‘‘is not the central figure’’ in the investigation of intern Chandra Levy’s disappearance.