An intruder carrying a shotgun breached security at the White House Correspondents' Association dinner, according to officials investigating the incident.

Investigators said the suspect was running at approximately 9 miles per hour when he sprinted through a security checkpoint and discharged his weapon. Officials are examining whether a gunshot may have struck an officer's phone that was in the pocket of a bulletproof vest.

Secret Service Director Sean Curran defended his agents' response to the security breach during a Senate Judiciary Committee briefing on Tuesday. "My agents did a great job," Curran told CBS News, praising how they reacted to what he described as an "unexpected intruder."

The incident occurred at the annual White House Correspondents' Association dinner, a high-profile event that typically draws journalists, government officials, and other dignitaries. The dinner requires extensive security coordination given the prominence of attendees.

Details about the suspect's identity, motive, or current status were not immediately available. The Secret Service has not released additional information about potential injuries or the full scope of the security response.