The gunman who attempted to storm the White House Correspondents’ Dinner assembled a “long weapon” in a room near the ballroom before opening fire,according to a volunteer at the event.

The volunteer, a woman called Helen Mabus, described a “makeshift room” near the entrance that had “no security.”

“He was in that room… he grabbed it [the gun] out of a bag or something,” Mabus said.

She added that the gun “was long” and “didn’t look like a typical gun.”

🚨BREAKING: Dramatic new video shows law enforcement with guns drawn searching for the shooter and yelling “We have one down" as panic and confusion erupted after gunshots were heard at the White House Correspondents’ Dinner. |@GiannoCaldwellpic.twitter.com/WlUitinh2w

“He put it together and… ran towards the stairs to go down to the ballroom.”

The gunman then began firing in multiple directions: “shooting all over the place.” She estimates he fired “at least ten shots.”

🇺🇸 | URGENTE: CNN: El sospechoso ensambló un arma "larga" en un área con monitoreo ligero cerca de la entrada del nivel de la terraza, según un testigo voluntario.-La sala tenía carritos de bar almacenados y "sin seguridad" en ese momento.-La testigo Helen Mabus dijo que el…pic.twitter.com/SaGZujAcGj

The gunmanhas been identifiedas Cole Thomas Allen, a 31-year-old from California.

Allen hails from Torrance, California, close to Santa Monica, Los Angeles.

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