A deadly breach of the U.S. Capitol’s perimeter could delay the gradual reopening of the building’s grounds to the public, just as lawmakers were eyeing a return to more normal security measures following the January 6th insurrection.

Capitol Police officer William “Billy” Evans, an 18 year veteran of the force, was killed Friday when a man rammed his car into a barrier immediately outside the U.S. Senate side of the building.

The driver of the car also died after police shot him.

The incident came fewer than two weeks after the Capitol Police removed an outer fence that had cut off a wide swath of the area off completely from vehicular and police traffic.