In this Jan. 6, 2021, image from video, Alan William Byerly, right, is seen allegedly attacking an Associated Press photographer during a riot at the U.S. Capitol in Washington. Byerly has been arrested on charges that he assaulted an Associated Press photographer and police officers.

COLLEGE PARK, Md. — A Pennsylvania man was arrested Wednesday on charges that he assaulted an Associated Press photographer and police officers during the Jan. 6 riot at the U.S. Capitol.

Alan William Byerly, 54, was armed with what appeared to be a stun gun when he charged at officers guarding the Capitol, an FBI agent wrote in an affidavit. After police apparently removed the device from his hand, Byerly continued to charge at the officers, punching or pushing at least three of them, and tried to grab an officer's baton, the agent wrote.

Officers managed to restrain Byerly, but a fellow rioter helped him escape, the FBI said. Police recovered the stun gun that he apparently wielded.

Body camera footage captured Byerly assaulting three Metropolitan Police Department officers, according to the affidavit.

Byerly also is accused of attacking an AP photographer who was wearing a helmet-style gas mask and a lanyard with Associated Press lettering.

A photo shows Byerly standing behind a group of people who pulled the photographer backward down a set of stairs leading up to the western front of the Capitol building, the affidavit says. At the bottom of the stairs, Byerly and three other people grabbed the photographer and pushed, shoved and dragged him toward the site of the original altercation, the agent wrote.

“It is deeply troubling when journalists are targeted for simply doing their jobs,” AP media relations manager Patrick Maks said in a statement Wednesday. “These charges are an encouraging sign that those who attacked journalists on Jan. 6 will be held accountable.”

A federal magistrate in Allentown, Pennsylvania, ordered Byerly to be jailed pending a detention hearing on Monday. Court records don't list a defense attorney for him.

The charges against Byerly in a June 25 complaint include assaulting a federal officer, obstruction of law enforcement during civil disorder and violent entry and disorderly conduct on Capitol grounds.

The AP reported last week that the fence erected around the Capitol after the insurrection is expected to be removed as early as Friday, weather permitting. The U.S. Capitol Police said the temporary fencing can be reinstalled quickly, if necessary. Building restrictions remain in effect.