NFL Staffer ‘Seriously Injured’ After Attack by Lone Shooter at N.Y.C Headquarters That Killed at Least 4

An NFL staffer is recovering in the hospital after a deadly mass shooting at 345 Park Avenue in New York City on Monday, July 28, that left five people dead and several others injured.

The shooting began around 6:30 p.m. local time when 27-year-old Shane Devon Tamura of Las Vegas entered the Midtown Manhattan office building, which houses several major organizations, including the NFL’s headquarters. Armed with an M4 rifle, Tamura opened fire in the lobby before moving through the building and ultimately taking his own life on the 33rd floor.

NFL Commissioner Roger Goodell confirmed in a staff memo — obtained by CNN and verified by PEOPLE — that one employee was “seriously injured” in what he described as an “unspeakable act of violence.”

“He is currently in the hospital and in stable condition,” Goodell wrote. “NFL staff are at the hospital and we are supporting his family during this difficult time.”

Goodell added that all other NFL personnel have been accounted for and are safe. “We are deeply grateful to the law enforcement officers who responded to this threat quickly and decisively and to Officer Islam, who gave his life to protect others,” the memo read.

The officer referenced, 36-year-old NYPD officer Didarul Islam, was working security at the building when Tamura opened fire. Islam was among the four victims killed in the attack, along with two women and another man whose names have not yet been released. Four others were injured while attempting to flee the scene.

Surveillance footage showed Tamura exiting a double-parked BMW outside the building with a rifle in hand before entering the lobby and firing at people inside. He eventually took the elevator to the 33rd floor — home to Rudin Management — where he fatally shot one person and then himself, according to N.Y.C. Police Commissioner Jessica S. Tisch.

Tamura reportedly had a documented history of mental health issues, police said during a press conference at Weill Cornell Medical Center.

Authorities believe Tamura was attempting to reach the NFL’s offices but mistakenly took the wrong elevator. A motive has not been confirmed, though law enforcement recovered a suicide note in which Tamura mentioned the NFL, brain trauma, and asked that his brain be studied for signs of CTE.

Goodell said the league is providing “significant resources” for employees affected by the incident and encouraged New York-based staff to work remotely for the time being. “Every one of you is a valued member of the NFL family,” he wrote. “We will get through this together.”

Police have confirmed Tamura acted alone, and there is no ongoing threat to the public.