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. 

"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.

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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.