Obama staff inside Westside office when vandals struck
Initially, officials thought BBs or pellets were used in the vandalism in the incident Thursday that took place at 7:25 p.m. in the 6700 block of South Centinela Avenue, but sources said no evidence of those items was found.
Authorities are also looking at whether the vandals used a crow bar, tire iron or other large instrument to smash the windows.
Though the campaign workers heard breaking glass, they did not see anything, sources said. A Los Angeles Police Department spokeswoman initially said no one was in the office at the time.
FBI officials have offered assistance to determine whether the vandalism was a hate crime, an act of domestic terrorism or other incident that would prompt increased involvement from federal departments.
The U.S. Secret Service is also assisting in the investigation.
Obama is scheduled to visit Los Angeles on Monday to raise money for what is expected to be a bruising 2012 reelection campaign.
-- Andrew Blankstein
Photo: A repairman cleans glass early Friday as a campaign staff member looks at damage at President Obama's Westside office. Credit: Kevork Djansezian / Getty Images