The Westside campaign office of President Barack Obama was vandalized Sept. 22 while staff were working inside, though no one was injured, police said.

The incident occurred just days before the president visited the Los Angeles area Sept. 26. A Los Angeles Police Department spokesman said it was unclear if the campaign office in the 6700 block of Centinela Avenue in Del Rey was specifically targeted or if the timing was related to the president’s visit.

Campaign staff were working inside the office at about 7:25 p.m. Sept. 22 when they heard the sound of glass breaking in another room. They went outside where they saw broken glass from a side window and door, but after searching the area, no object was found, police said.

Police believe the vandalism was apparently caused by a projectile device, possibly a BB gun or sling shot. No threats associated with the vandalism were discovered, the police spokesperson said.

He said the incident appears to be isolated and the motive is unknown. There was no suspect description and police were unable to locate any surveillance video.

The incident is under investigation.