Texas police are investigating an overnight shooting at the Houston office of state Sen. John Whitmire, the Houston Chronicle reported Thursday.

Whitmire said in an interview with the Chronicle his staff initially thought the damage to his office was caused by heavy thunderstorms in the area. Then he noticed bullet slugs on the floor.

“There are bullet slugs everywhere,” Whitmire said. “One lodged in a framed picture. It’s pretty amazing.”

Whitmire called his office a “crime scene” and noted the shooting was “concerning in this day and time.”

Houston police have not yet identified a motive for the crime, according to the Chronicle’s report.

Whitmire has served in the Texas Senate for over 30 years and is the longest-serving current member. He is a vocal critic of the state’s gun laws and has spoken out against the recently passed campus carry law.

On the day the bill legalizing open carry for handguns passed the Texas Senate last March, the Houston Democrat spoke from the Senate floor. Whitmire said his fellow lawmakers were “making a very serious mistake.”