FBI probes blast outside Social Security building in Arizona
(CNN) — An explosion erupted Friday morning at the Social Security office in Casa Grande, Arizona, the FBI said.
No injuries were reported, and authorities weren't commenting on whether anyone is in custody, FBI spokeswoman Jennifer Giannola said.
The explosion occurred outside a door, causing a small fire and minimal damage, said Casa Grande Fire Marshal Barbara Rice.
The building was evacuated, but the surrounding buildings were not, Rice said.
FBI bomb technicians and hazardous materials experts were participating in the investigation, Giannola said.