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.

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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.