Questions About Security Around The Capitol Complex Emerge After Bomb Threat

The confrontation between authorities and a man who pulled up next to the Library of Congress claiming to have a bomb in his truck ended with his peaceful surrender on Thursday afternoon.

It took hours of negotiations and at least three law enforcement agencies — the U.S. Capitol Police, the F.B.I. and the Bureau of Alcohol, Tobacco, Firearms and Explosives — to safely persuade Floyd Ray Roseberry to stop ranting about a "revolution" and turn himself over to authorities.

But the ease with which Roseberry gained such close access to the sidewalk next to...