U.S. Capitol Police in Washington, D.C., arrested an 18-year-old man Tuesday after he ran from his vehicle toward the west side of the Capitol Building armed with a shotgun.

A man was arrested Tuesday after running toward the Capitol with a loaded shotgun, Capitol Police said.

Capitol Police Chief Michael Sullivan said the man, armed with the loaded shotgun and carrying additional rounds, drove a white Mercedes SUV near the Capitol before exiting and running toward the buil...