Four people, including an off-duty New York City police officer, were killed and another person was critically wounded in a shooting Monday at a midtown Manhattan building that houses the National Football League offices and some of the country's top financial firms, authorities said.
Police identified the rifle-wielding gunman as Shane Tamura, of Las Vegas, and said he killed himself. He had a "documented mental health history," but the motive was still unknown, Police Commissioner Jessica Tisch said at a news conference.
"We are working to understand why he targeted this particular location," Tisch said of 345 Park Ave., a 44-story commercial office building that houses a number of high-profile tenants, including finance companies Blackstone and KPMG, and the consulate general of Ireland, along with the headquarters of the NFL.
The officer who was killed was Didarul Islam, 36, an immigrant from Bangladesh who had served as a police officer in New York City for 3½ years.
"He died as he lived. A hero," Tisch said. He was married with two young boys. His wife is pregnant with their third child, Tisch said.
One man was seriously injured and remains in critical condition, Mayor Eric Adams said. Four other people sustained minor injuries attempting to flee the scene.
Later Monday, NFL commissioner Roger Goodell issued a memo to employees saying an NFL employee was "seriously injured" in the shooting.
"He is currently in the hospital and in stable condition," Goodell wrote in the memo, which was obtained by ABC News. "NFL staff are at the hospital and we are supporting his family. We believe that all of our employees are otherwise safe and accounted for, and the building has nearly been cleared."
Goodell said in the memo that there would be "increased security presence" at the league's offices "in the days and weeks to come."
Adams earlier said that officials were still in the process of "unraveling" what took place.
The New York City Fire Department said emergency crews were called to the Park Avenue office building around 6:30 p.m. for a report of someone shot.
NFL employees were told to shelter in place at the time, ESPN's Jeff Darlington reported. The NFL offices are on floors five through eight.
Surveillance video showed a man exiting a double-parked BMW and carrying an M4 rifle before he walked toward the building. He immediately opened fire on the NYPD officer as he entered the building and shot a woman who tried to take cover. He then began "spraying" the lobby with gunfire, Tisch said.
The man then went to the elevator bank and shot a security guard who was taking cover behind a security desk and shot another man in the lobby, the commissioner said.
Officers found a rifle case, a revolver, magazines and ammunition in his car, Tisch said.
She said an initial investigation shows his vehicle traveled across the country through Colorado on July 26, then Nebraska and Iowa on July 27 and arrived in Columbia, New Jersey, as recently as 4:24 p.m. Monday. He drove into New York City shortly thereafter, she said.
No one answered the door at the address listed for Tamura in Las Vegas.
Jessica Chen told ABC News that she was watching a presentation with dozens of other people on the second floor when she "heard multiple shots go off in quick succession from the first floor."
She and others ran into a conference room and barricaded tables against the door.
"We were honestly really, really scared," she said, adding that she texted her parents to tell them that she loves them.
Local TV footage showed lines of people evacuating the office building with their hands above their heads.
Some finance workers at an office building down the block were picking up dinner at a corner eatery when they heard a loud noise and saw people running.
"It was like a crowd panic," said Anna Smith, who joined the workers returning to the finance office building. They remained there for about two hours before being told they could leave.
Tisch said she believed two officers were working in different parts of the building as part of a program where companies can hire NYPD officers to provide security.
The building where the shooting occurred is in a busy area of midtown, located a short walk north from Grand Central Terminal and about a block east of St. Patrick's Cathedral.
The city's emergency management alert system warned of traffic delays, road closures and disruptions to public transportation in the area.
Information from The Associated Press was used in this report