The shooting at Naval Air Station Corpus Christi on Thursday is being considered a terror-related attack — and a second person of interest could be at large, according to reports.

The shooter, who has not been identified, was killed, but not before injuring a Navy police officer in what FBI officials told ABC News was an attack motivated by terror. Authorities are now considering a second person involved could be on the loose.

“The public should remain calm, and if you see something, say something,” FBI officials told the outlet.

The shootout unfolded Thursday morning around 6:15 a.m. local time when the suspected shooter speed through a gate at the facility. A vehicle barrier was activated that stopped the car, but the shooter then hopped out and started firing a weapon.

“We have determined that the incident this morning at the Naval Air Station Corpus Christi is terrorism-related,” the FBI’s Leah Greeves told ABC. “They are working diligently with local, state and federal partners on the investigation, which is fluid and evolving.”

Security forces eventually “neutralized” the shooter, with the injured sailor suffering minor injuries. A defense official told the Navy Times that the officer was struck by a bullet, but that the round was stopped by their protective vest.

The chaotic scene forced the station to be placed on lockdown until shortly before noon. The injured sailor was hospitalized and released later in the day, according to ABC.