ATF: Explosion was domestic terrorism or a terrible prank

The front of the U.S. Air Force Recruiting Center. KJRH

Bixby Police responded along with the Tulsa Police bomb squad. The office's front doors were damaged by the explosion, but it wasn't clear how much damage occurred inside the office, the World said.

There was no one in the building at the time and no one was injured.

The blast took place around 10.30pm local time (4.30pm GMT) in Bixby, which lies around 15 miles to the south of Tulsa.

Witnesses told investigators that someone on a red motorcycle threw a backpack at the recruiting center, which then exploded, according to KJRH in Tulsa.

It is noted that Federal Bureau of Investigation and ATF are investigating the cause of the explosion.

The FBI said earlier Tuesday the explosion is not now being considered an act of terrorism.

"There's no doubt that military offices have been targeted in shootings and explosions in the past, but we also see people blowing off their fingers or blowing up their garages", Davis said.

Investigators have reportedly indicated such a designation can not occur until a suspect or a motive becomes known. They believe it may have been a pipe bomb. A vehicle's tires were slashed and some windows broken at that office.

The damage caused by the explosion at an Air Force office in Oklahoma.

One of the office's two front doors was off its hinges Tuesday morning and lying in the parking lot. Law enforcement agents are reportedly following up on the potential lead. "So, we're treating it as strictly a criminal investigation with an explosive device", Rice said.

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