Joint Base San Antonio-Fort Sam Houston was put on lockdown early Friday morning after a vehicle with two occupants ran a gate.

One of the alleged gate-runners has been detained, but the other is still at large.

The 502nd Air Base Wing, which is the host unit for the joint base, said in a release that the lockdown began at about 4 a.m, after the vehicle ran the Schofield gate. Security forces pursued the vehicle, and the two occupants ditched the vehicle and fled on foot, when one was caught.

The other occupant, who remains at large, has been identified. Security forces and San Antonio police are working together on the incident.

The lockdown was lifted at 10:11 a.m., after an extensive search of the base, and normal operations resumed.

“Security forces personnel are taking every measure to ensure the safety of our service members, their families and civilian employees,” the release said.