A U.S. Secret Service agent assigned to former First Lady Jill Biden accidentally shot himself in the leg early on Friday near Philadelphia International Airport, according to a source familiar with the incident.

In a statement that did not mention Biden, the Secret Service said the incident occurred just after 8:30 a.m. EST and the agent suffered a non-life-threatening injury.

“There was no impact to the protectee’s movement and they were not present at the time of the incident,” the statement said.

The agent “accidentally discharged his firearm” while traveling in an unmarked SUV near the airport, Philadelphia Police Department Cpl. Jasmine Colón-Reilly said in a statement.

Emergency medical personnel responded to the scene and the agent was transported to Penn Presbyterian Medical Center in stable condition, Colón-Reilly said.

“The Secret Service’s Office of Professional Responsibility will be reviewing the facts and circumstances of this incident,” the Secret Service said.

The Secret Service is responsible for providing security to current and former presidents, vice presidents and their families and foreign leaders and is also an investigative agency.

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(Reporting by Christian Martinez in Los Angeles; editing by Scott Malone and Chris Reese)