Radford, Virginia (CNN) A photographer covering a Donald Trump rally in Virginia said a Secret Service agent choked him and slammed him to the ground Monday as he tried to leave a media pen at the event where a protest erupted.

A video of the incident shot by an attendee at the rally and later posted on social media shows the agent putting two hands on the photographer's neck and slamming him to the ground.

Time magazine photographer Chris Morris told CNN that as he tried to exit the media pen, a Secret Service agent began choking him.

"I'm not pressing charges," Morris said Monday. "I stepped 18 inches out of the pen and he grabbed me by the neck and started choking me and then he slammed me to the ground."

A Secret Service spokesman said the agency is "aware of an incident involving an employee" and will provide further details of the incident after they gather the facts.

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