Vandals smashed windows and fired BB-gun pellets at President Obama’s campaign office in Westside Los Angeles, three days before the president was set to arrive in the area for a series of re-election fundraisers.

The Los Angeles Police Department said the attack, first reported by the Los Angeles Times, occurred at 7:25 p.m. Thursday. No one was inside the office at the time, and there were no injuries.

“This does raise some concern ahead of the president’s visit next week. I’m sure,” LAPD media relations officer Gregory Baek told ABC News.

Baek said the department had not identified any suspects but is continuing to pursue leads.

The U.S. Secret Service is also aware of the incident and is closely following the investigation.

“We continue to monitor all incidents, whether it be vandalism like this or any events tied to the president,” said spokesman Max Milien.

An Obama campaign aide confirmed the incident but offered no further comment. It’s not clear whether other offices have been targeted recently.

Obama visits L.A. Monday as part of a three-day western states campaign swing that includes fundraisers in San Francisco, San Diego and Seattle.