The U.S. Capitol was briefly placed on lockdown and a suspected gunman was taken into custody at the visitors' center Monday afternoon.
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Capitol Police Chief Matthew Verderosa declined to name the suspect during a press conference but said the man "frequented the Capitol grounds before."
"We believe the suspect is known to us," Verderosa said.
Verderosa also corrected initial reports that a U.S. Capitol Police officer had been shot. The suspect, who pulled a gun as he was going through a metal detector, was injured and taken to a local hospital. A female bystander was also wounded by shrapnel.
Sources told ABC News the suspect was identified as Larry Dawson of Tennessee. The 66-year-old yelled from the balcony of the House of Representatives that he was a "prophet of God" last year. He was charged with unlawful conduct and assault on a police officer on Oct. 22, 2015.
"I was with a group of my colleagues walking into the visitor center and as we were literally going through the metal detectors, people started screaming, 'Get out! Get out!' We didn't know which way to run," Jill Epstein, executive director of the California Association of Marriage and Family Therapists, told WRC-TV in Washington, D.C.
Diane Bilo, a visiting tourist from Cincinnati, told reporters her husband was inside the building during the shooting, Fox News reported. The man sent a text saying "it sounded like a full [magazine]" was emptied during the confrontation.
The White House was also placed on lockdown until police determined the shooting was an isolated incident.
Both the House and the Senate are in recess this week.