The newly installed chief of the U.S. Capitol Police says the risk to lawmakers is higher than ever. And the threat from lone-wolf attackers is growing.

More than 400 people have been charged with federal crimes in the Jan. 6 attack on the Capitol. But prison time may be another story.

A Capitol Police officer was killed Friday after a man rammed a car into two officers at a barricade outside the U.S. Capitol and then emerged wielding a knife. It was the second line-of-duty death this year for a department still struggling to heal from the Jan. 6 insurrection.