William M. Welch

USA TODAY

Fort Sam Houston in San Antonio was put on lockdown for several hours Sunday evening while authorities investigated a vehicle that failed to stop at an entrance checkpoint, officials said.

KENS-TV reported that a driver was in custody after driving through a gate to enter the base without stopping, triggering a manhunt. An explosives disposal team was brought in to inspect the vehicle.

A post spokesperson said there were no other passengers in the vehicle at the time and no other individuals are suspected of being involved, the station reported.

A desk sergeant, who declined to give his name citing department policy, confirmed the lockdown at the Army post. It was lifted shortly before 9 p.m. CT, about three hours after it began.

The Bexar County Sheriff's Department said on Twitter that the lockdown was being handled by military police, and the sheriff's department had no units assigned to the case.

The base public affairs office did not respond to telephone and email requests for information.

Reports on Twitter said cars were being prevented from entering or leaving the base, and that large lines formed at the gates.

According to the city of San Antonio's website, the base was established in 1910 — the ninth-oldest Army installation in the country. Fort Sam Houston now encompasses 3,000 acres and is home of military medicine and part of Joint Base San Antonio.

The base is home to the 502nd Force Support Group and is named for the first president of the Republic of Texas

As part of Joint Base San Antonio, Fort Sam Houston contains more than 900 historic buildings representing different construction eras. It was designated as a National Historic Landmark in 1975, according to the installation's website.

Contributing: The Associated Press