Nearly two dozen people were killed in Lewiston, Maine, Wednesday night, a federal official told the Wall Street Journal, after a gunman opened fire on patrons at a restaurant and a bowling alley.

A manhunt involving hundreds of officers is underway for Robert Card, 40, who has been identified as a person of interest in the shooting.

“Card is considered armed and dangerous,” the state’s public safety commissioner Mike Sauschuck said following the shooting spree. Maine State Police issued advisories throughout the night and Thursday morning for residents to shelter-in-place.

Police reportedly visited Card’s family, including his sister-in-law, who resides in Bowdoin, a small town in Maine. “I’ve known my brother-in-law since high school and he’s always been a wonderful, loving person,” she wrote in a text message to the Journal. “Please pray for us.”

The Wednesday night attack is the deadliest mass shooting carried out in the U.S. this year.