FBI agents raided the home of a Los Angeles deputy mayor as part of an investigation into a bomb threat against City Hall, officials said Wednesday.

Zach Seidl, a spokesman for Mayor Karen Bass, said investigators raided the home of Brian Williams, deputy mayor for public safety, on Tuesday and discovered that Williams “had committed a crime against City Hall earlier this year.” They were reportedly investigating a bomb threat.

In a separate statement, also released by Seidl, the Los Angeles Police Department identified Williams as the “likely” sender of the bombing.

“Earlier this year, the Los Angeles Police Department responded to a bomb threat against Los Angeles City Hall,” the department said in a statement. “Our initial investigation determined that the source of the threat was likely Brian Williams, Deputy Mayor for Public Safety. Due to the department’s working relationship with Mr. Williams, the investigation was referred to the FBI. continues to be an investigative agency.

Seidl said Williams has been placed on administrative leave, but did not provide additional details.

“The mayor takes this issue very seriously,” he said. “When this threat was reported, the LAPD investigated and determined there was no immediate danger. After additional investigation, the LAPD referred the matter to the FBI for further investigation. ”

Mr. Williams could not be reached for comment.

FBI spokeswoman Laura Eimiller declined to comment, saying the agency could not confirm or deny any investigation.

Williams spent nearly two years in Bass’ office as deputy mayor, working on issues including police hiring, security spending and the search for a new police chief. Prior to that, he served as executive director of the Los Angeles County Sheriff’s Civilian Oversight Commission for seven years.

Williams worked in Bass’ office and oversaw the police department, fire department, port police, airport police and the city’s Office of Emergency Management, according to the hiring announcement.