A suspect began shooting Saturday evening at a security booth outside the White House where U.S. Secret Service officers were on guard inside, two sources familiar with the matter told CBS News. Somewhere between 10 and 20 shots were fired during the initial encounter.

Secret Service officers returned gunfire, wounding the suspect, according to the sources. None of the Secret Service officers on duty are believed to have been struck by the gunfire.

ABC News Senior White House Correspondent Selina Wang captured the audio of the gunshots while filming a video on the White House North Lawn. In a post shared on social media, Wang stated that she was recording on her phone when the incident began.

“It sounded like dozens of gunshots,” Wang said in the post. She added that members of the press corps were ordered by security personnel to immediately run into the indoor press briefing room, where reporters were held while the complex was under lockdown.

The U.S. Secret Service shot a person near the White House grounds on Saturday evening after the individual opened fire on a security booth, law enforcement officials told the Associated Press. A bystander was also injured by gunfire during the exchange.