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A police officer was killed and at least two other people were shot Monday in a Midtown Manhattan office building that houses several financial and other firms, according to law enforcement officials.

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The police did not immediately provide details of the shooting, including the condition of the other people who were shot. Shortly before 8 p.m., Jessica Tisch, the police commissioner, said the gunman was dead.

“The scene has been contained, and the lone shooter has been neutralized,” she said in a social media post. Despite that, a lockdown at the building remained in place.

The police have identified the gunman as Shane Devon Tamura, 27, of Las Vegas, according to a law enforcement official briefed on the matter. He died in the 33rd floor offices of the Rudin Management real estate firm, according to a person with knowledge of the circumstances of his death.

The shooting occurred about 6 p.m. inside the building, at 345 Park Avenue, between 51st Street and 52nd Street. By 6:10 p.m., dozens of officers had flooded the area, according to a witness, Ben Ryder Howe, a freelance journalist.

Others with offices in the building include the investment giant Blackstone, the National Football League and the accounting and financial advisory firm KPMG. As of N.F.L. staff members were sheltering in place, awaiting clearance from the police to leave.

By about 7 p.m., people began to march out of the building in small groups with their hands raised, Mr. Howe said. A short time later, with police helicopters hovering, a larger group left the building.

Workers in the Park Avenue building streamed into the street after the shootings.Credit…Olga Fedorova for The New York Times

Some ran as fast as they could. Others walked, seemingly unfazed by what was going on around them. Nearby buildings that had also been locked down began to empty as well, with many people leaving with their hands raised, presumably to show that they were not armed.

A Blackstone employee who works on the 31st floor said that workers there heard a loud bang and thud coming from above. They shrugged it off until they got an email notifying them of a shooter in the building.

In a follow-up email, the employee said they were told to evacuate the building, but by then police officers were leading people downstairs a floor at a time in elevators.

Across Wall Street, employees at other private equity firms and banks said they had swapped worried text messages and photos with their friends at Blackstone. One Blackstone employee shared a photo that was passed along to The New York Times that showed couches piled close to the ceiling as a barricade. Two Blackstone employees told friends they were hiding in the office pantries, according to people who received the messages.