Emergency crews rushed to contain a raging four-alarm fire after a small aircraft slammed into a commercial building, forcing widespread evacuations and leaving several people injured.
Local fire officials say the aircraft flew into a building in Fullerton, California, before bursting into flames.
The impact triggered an explosion that engulfed the building, which authorities identified as either an office complex or a warehouse.
First responders reported at least four people injured in the incident, though the full extent of casualties remains unclear.
Fire crews continue working to control the blaze while paramedics treat the wounded.
Investigators have yet to determine what caused the aircraft to crash.
The Federal Aviation Administration is expected to launch a formal investigation into the incident.
