SAN ANTONIO (AP) — Military officials say a vehicle forced its way through an Army post entrance gate in South Texas, prompting a lockdown as security forces pursued the vehicle.

Joint Base San Antonio military officials said in a statement posted to Twitter that the vehicle, containing two people, ran the gate at Fort Sam Houston in San Antonio around 4 a.m. Friday.

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The two people fled the vehicle. One of them was apprehended, but authorities say they’re still searching for the second person.

Authorities have not indicated who was in the vehicle or what their intentions were.

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The incident prompted a lockdown that was later lifted. A second lockdown was later ordered that ended about 10:30 a.m. It’s not clear if the second lockdown also was related to the security gate breach.