The suspected blast mangled the entrance around 10:30 p.m. and scattered debris on a sidewalk outside the military recruitment center in the southeast Tulsa suburb of Bixby, photos show.
The FBI says a pipe bomb explosion that damaged an Air Force recruiting station in northeast Oklahoma is not being called an act of domestic terrorism. They called in Tulsa's bomb squad to help clear the scene and make sure there were no other devices in the area. Officials from the FBI and ATF, the federal agency in charge of investigating bombs, are also present should the explosion fall under their jurisdiction - for example if it is classified an act of domestic terrorism.
Rice said they have a few leads but have not confirmed a suspect yet.
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Early reports indicate the fragments were consistent with a pipe bomb, Federal Bureau of Investigation spokeswoman Jessie Rice said, but the type of bomb has not been confirmed.
Several days before the Tulsa area Air Force recruiting center was bombed, a National Guard recruiting center in the area was vandalized.
The FBI is checking with nearby businesses for video, interviewing witnesses and trying to rebuild the bomb. But terrorism has not been ruled out as a possible motive. The individual or individuals involved in the incident vandalized the building and slashed tires of vehicles at the center.