Gunman kills four people in New York office building shooting before taking his life
Police identified the gunman as Shane Tamura, of Las Vegas, and said he also wounded a fifth person before taking his own life.
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," she said.
The officer who was killed was a 36-year-old immigrant from Bangladesh and had served as a police officer in New York City for three and a half years.
"He died as he lived. A hero," Ms Tisch said.
Mayor Eric Adams said the man who was injured remained in a critical condition.
He added that officials were still "unravelling" what took place.
"Five innocent people were shot," he said.
Surveillance video showed a man exiting a double-parked BMW with an M4 rifle before he walked toward the building.
He immediately opened fire on the NYPD officer as he entered the building, shot a woman who tried to take cover, then began "spraying" the lobby with gunfire, Commissioner Tisch said.
The man then made his way to the elevator bank and shot a security guard who was taking cover behind a security desk, and another man in the lobby, the commissioner said.
Officers found a rifle case, a revolver, magazines and ammunition in his car, she added.
The Fire Department of New York said emergency crews were called to the Park Avenue office building following a report someone had been shot.
A spokesperson said the call came in at about 6:30pm on Monday, local time, but provided no other details.
Jessica Chen told ABC News US 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 loved them.
Mayor Adams posted a clip to social media urging people still inside the office building to stay put because police officers were conducting a floor-by-floor search.
The Democrat said he was headed to the hospital to speak with the family and loved ones of those involved.
Local TV footage showed lines of people with their hands above their heads evacuating the office building.
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, AP reported.
"It was like a crowd panic," said Anna Smith, who joined the workers pouring back into the finance office building.
They remained there for about 2 hours before being told they could leave.
The building includes offices for Blackstone and the Consulate General of Ireland, located a short walk north from Grand Central Terminal.
The city's emergency management alert system warned of traffic delays, road closures and disruptions to public transportation in the area.
Through late July, New York City is on pace to have its fewest murders and fewest people hurt by gunfire than any year in recent decades.
AP

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