Police were at a loss as to why a vandal fired a pellet gun into the Westchester campaign office of President Barack Obama, shattering windows and a glass door but causing no injuries to the four people inside.

On Thursday around 7:25 p.m., officers investigated the shooting at the office in the 6700 block of South Centinela Avenue near the San Diego (405) Freeway in response to a report of glass breaking, said Officer Sara Faden, a Los Angeles Police Department spokeswoman.

“There were four campaign workers in a back part of the offices and they heard the noise of glass. When they went to the front, they saw the glass with pellet gunshots in it,” added Sgt. Richard Parks of the department’s Pacific station.