There were multiple journalists in attendance at the dinner who have shared their first-hand experiences.
Alexandra Ingersoll, a correspondent for One America News, told Agence France-Presse she was inside when the commotion began and saw Secret Service spring into action to protect the president.
"I just ducked under the table, and I was like 'I'm not going to risk this,'" she told AFP. "I didn't know if the shooter was neutralised or what was going on."
With still few details on what actually occurred, the entire ballroom was evacuated, and several hundred guests made their way into the Hilton lobby and out into the chilly air.
Guests were seen hugging, making calls, texting friends and loved ones, and their news bureaus.
ABC's Americas Editor John Lyons was in the room when the incident unfolded.
"What happened was when those people heard some shots, apparently three or four shots outside the actual main room, suddenly shouts went up from Secret Service who were dotted all through the ballroom," Lyons said.
At about 8.40pm local time, an AFP reporter saw police officers racing through the streets surrounding the Hilton, lifting barriers, ushering passersby over to different streets, and clearing cars from the area as quickly as possible. A helicopter circled overhead.
A few minutes later, a motorcade left the Hilton, in the direction of the White House.
— Alexandra Koster, with reporting by Agence France-Presse