Security forces at the Joint Base San Antonio-Lackland (JBSA) returned fire early Saturday on at least one drive-by suspect who is accused of firing upon the main gate at the JBSA-Chapman Training Annex, a JBSA spokesperson tells Fox News Digital.

The officers were fired upon at around 4:30 a.m. by at least one suspect in a sedan and immediately returned fire. There were no injuries reported, and the gate was shut for a number of hours. 

It is unclear how many shooters were involved and how many times they fired upon the base. 

US AIR FORCE SERVICE MEMBER FOUND DEAD IN SAN ANTONIO HOME, OFFICIALS SAY

A military policeman stands guard at JBSA-Lackland Air Force Base

A military policeman stands guard at JBSA-Lackland Air Force Base on June 9, 2021, in San Antonio. Security officers at the base returned fire early Saturday on at least one drive-by shooter who fired on the main gate at the JBSA-Chapman Training Annex. (AP Photo/Eric Gay)

"There was no active threat to the installation … and our security forces responded to mitigate the threat," spokesperson Stefanie Antosh said, noting that the suspect or suspects did not try to breach the gates.

San Antonio police officers also arrived at the scene to assist in the investigation, Antosh said. 

A motive for the shooting is not known.

The JBSA-Chapman Training Annex entry gate was closed and reopened at around 9:30 a.m. local time. Drivers were advised to use an alternate gate located north of primary on Ray Ellison Boulevard.

Lackland air force base gate

A pedestrian passes the main gate at Lackland Air Force Base in San Antonio on Feb. 5, 2020.  (AP Photo/Eric Gay, File)

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In addition to Lackland, Joint Base San Antonio includes Randolph Air Force Base, Fort Sam Houston and the Camp Bulllis training camp.

Lackland is home to more than 24,000 active duty members and 10,000 Department of Defense civilians, according to the base website. It includes the 37th Training Wing; 149th Fighter Wing; 59th Medical Wing; the Air Force Intelligence, Surveillance and Reconnaissance Agency; 24th Air Force Wing, 67th Network Warfare Wing; the Cryptologic Systems Group; the National Security Agency; and 70 associated units.

The Associated Press contributed to this report.