U.S. Congresswoman Jackie Walorski and two members of her staff died on Wednesday when the vehicle they were traveling in collided head-on with a car that veered into their lane, police in Indiana and her office said.

"A northbound passenger car traveled left of center and collided head on" with Walorski's vehicle, killing all three occupants, the sheriff's office said.

The White House said it would fly flags at half-staff in her memory.