An airport security checkpoint at Lindbergh Field was shut down Thursday evening because of what looked like a grenade, TSA officials said.
The suspicious device was found in a box during luggage screening at 4.45 p.m.
The Southwest Airlines checkpoint inside terminal one was shutdown, according to airport official Sharie Shipley. Investigators cleared 300 feet around the box until 5:52 p.m. when the area was reopened.
The bomb squad was on scene inspecting the box. TSA officials say the oject was "shaped in the form of a grenade," but turned out to be a false alarm.