The explosion caused heavy damage to the doors of the Air Force Recruitment Center in a shopping plaza just after 10:30 p.m.
An explosion outside an Oklahoma Air Force recruiting center is being investigated as a possible act of domestic terrorism, but the late-night blast could also have been a terrible prank, a federal agent said Tuesday.
Now the FBI and the Bureau for Alcohol, Tobacco, Firearms and Explosives are investigating what type of bomb was used - and what the motive was.
If domestic terrorism is the cause, it would be the latest attack in the last nine years of military recruiting offices across the United States.
No one was inside the recruiting center when the pipe bomb went off, and no one was injured.
Rice said they have a few leads but have not confirmed a suspect yet. Witnesses vaguely describe the suspect as being a person on a red motorcycle.
"At this point, we don't know if it was a disgruntled employee, an act of domestic terrorism, just someone playing games".
Photos from the scene show the main doors to the office has been blown open with some debris found on the sidewalk entrance and in the parking lot; a hanging light fixture that looks to have been dislodged in the blast.
Several days before the Tulsa area Air Force recruiting center was bombed, a National Guard recruiting center in the area was vandalized. That vandalism included slashed tires.