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Source: Man held after blast outside Social Security building in Arizona

By Michael Martinez and Susan Candiotti, CNN
updated 10:03 PM EST, Fri November 30, 2012
The Social Security building was evacuated, but the surrounding buildings were not.
The Social Security building was evacuated, but the surrounding buildings were not.
STORY HIGHLIGHTS
  • NEW: Man was heading out of town, official says
  • Blast occurs outside door of Social Security building in Casa Grande
  • No injuries are reported, and a small fire causes minimal damage
  • FBI isn't commenting on whether anyone is in custody

(CNN) -- Authorities arrested a man during a traffic stop Friday in connection with an explosion at the Social Security office in Casa Grande, Arizona, a law enforcement official said.

The man is held under federal authority and faces possible state and federal charges, said the official with knowledge of the investigation.

"He was heading eastbound on the main road out of the Casa Grande area," the official told CNN.

The explosion occurred Friday morning outside a door, causing a small fire and minimal damage, said Casa Grande Fire Marshal Barbara Rice.

No injuries were reported, FBI spokeswoman Jennifer Giannola said.

The building was evacuated, but the surrounding buildings were not, Rice said.

FBI bomb technicians, the Bureau of Alcohol, Tobacco, Firearms and Explosives and hazardous materials experts were participating in the investigation.

CNN's Deanna Hackney and Carol Cratty contributed to this report.

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