NEW YORK (AP) — A gunman who killed four people inside a Manhattan office tower blamed his mental health problems on the National Football League and intended to target the league’s headquarters upstairs but took the wrong elevator, officials said Tuesday.

Investigators said Shane Tamura, a Las Vegas casino worker, was carrying a handwritten note in his wallet that claimed he suffered from chronic traumatic encephalopathy, known at CTE, and accused the league of hiding the dangers of brain injuries linked to contact sports.

Tamura, 27, shot several people in the skyscraper’s lobby and another in a 33rd-floor office on Monday before he killed himself, authorities said. Among the victims were an off-duty New York City police officer and a security guard.

The attacker’s grievances with the NFL emerged as police began piecing together the details of his life and the cross-country road trip that brought him to Manhattan. It’s unclear if Tamura showed symptoms of CTE, which can only be diagnosed by examining the brain after a person dies.

Tamura, who played high school football in California a decade ago but never played in the NFL, had a history of mental illness, police said. In the three-page note found on his body, he accused the NFL of concealing the dangers to players’ brains for profit. The degenerative brain disease has been linked to concussions and other repeated head trauma common in contact sports such as football

In the note, Tamura repeatedly said he was sorry and asked that his brain be studied for CTE. He mentioned a PBS Frontline documentary about the disease and referenced former NFL player Terry Long, who was diagnosed with CTE, and the manner in which Long killed himself in 2005.

The NFL long denied the link between football and CTE, but it acknowledged the connection in 2016 testimony before Congress and has paid more than $1.4 billion to retired players to settle concussion-related claims.

The shooting shakes Manhattan

NFL Commissioner Roger Goodell, who works out of the offices, called the shooting “an unspeakable act of violence in our building,” saying he was deeply grateful to the law enforcement officers who responded and to the one who gave his life to protect others.

Goodell said in a memo to staff that a league employee was seriously injured in the attack and was hospitalized in stable condition.

The shooting happened along Park Avenue, one the nation’s most recognized streets, and just blocks from Grand Central Terminal and Rockefeller Center. It’s also less than a 15-minute walk from where UnitedHealthcare CEO Brian Thompson was shot and killed last December by a man who prosecutors say was angry over corporate greed.

The attack drew a response from the White House, with President Donald Trump posting on social media, “My heart is with the families of the four people who were killed, including the NYPD Officer, who made the ultimate sacrifice.”

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