A Secret Service agent has been hospitalized after accidentally shooting himself at Philadelphia International Airport Friday morning.

The agent was injured at 8:42 a.m. while traveling in an unmarked Chevrolet SUV near an access point at the airport, the Philadelphia Police Department said. It was not immediately clear what caused the agent’s firearm to accidentally discharge.

Emergency responders transported the agent to Penn Presbyterian Medical Center, and he was placed in stable condition.

There were no other reported injuries, and airport operations were not interrupted. Authorities are continuing to investigate.