A gunman seen carrying an assault rifle killed five people, including one police officer, when he opened fire in broad daylight in the heart of New York City, before he reportedly took his own life.

Security camera photos posted online showed the gunman wearing a sport coat and button-down shirt while carrying the large rifle near a midtown Manhattan office building that houses Blackstone asset management and the NFL on Monday.

The gunman was identified as 27-year-old Shane Tamura from Las Vegas, according to law enforcement sources.

Officer Didarul Islam, who was working private security at the time, was shot in the back and killed. Three others were injured in the attack. Their conditions remain unclear.

Meanwhile, the gunman was found dead from a self-inflicted gunshot wound on the 33rd floor of the building, where Blackstone has its headquarters.

In an update on X, Police Commissioner Jessica Tisch said the ‘lone shooter has been neutralized’ and the scene is ‘contained.’

Videos shared online showed officers in protective gear entering the building at 365 Park Avenue with their guns drawn.

Another video taken by Fox 5 showed several officers carrying a victim, while others appeared to be tending to a person lying on the ground.

Photos posted online showed the gunman wearing a sport coat and button-down shirt while carrying the large rifle near a midtown Manhattan office building

The gunman was identified as 27-year-old Shane Tamura from Las Vegas 

Officer Didarul Islam, who was working private security at the time, was killed in the broad daylight attack

Islam, the officer, had just become a new father, sources said. EMS First shared a tribute to Officer Islam following the news.

‘Tonight, a chair at the dinner table is left empty. Tonight, a family grieves a loss that cannot be measured. Tonight, a hero made the ultimate, selfless sacrifice in the line of duty,’ it wrote on Instagram.

‘Remember his name. Honor his service. Never forget his face.’

Two people, a man and a woman, were also taken into custody at the scene, according to AMNY. The woman had a cut on her head and the man allegedly said, ‘Free Palestine, I’m not the active shooter.’ 

A witness told The New York Post that ‘it sounded like a barrage of shots …Like an automatic weapon. Like a high-capacity weapon.’

Another person told the paper that a ‘guy came in with an assault rifle and started shooting.’ 

A shocking image showed the victim splayed out on the floor of the office building after he suffered the self-inflicted gunshot wound. 

The New York Police Department urged the public to avoid the area of East 52 Street between Park Avenue and Lexington Avenue

New York State Police troopers were seen responding to the scene at 365 Park Avenue

Tamura, the gunman, grew up in Hawaii where he had played football in high school. 

Sources told NBC News that investigators were probing whether he may have been targeting the NFL offices.

He started the rampage in the lobby of the office building where he first exchanged gunfire with the NYPD Officer Islam, according to CNN.

Tamura then proceeded up the the 33rd floor where police received calls of shooting. The gunman was then found dead of a self-inflicted gunshot wound.

‘It appears that he knew it would be his last stand,’ said CNN chief law enforcement analyst John Miller, a former NYPD deputy commissioner. 

‘He fully intended to shoot his way through the lobby and make his way to that target – whatever that might have been.’

A photo of the blood-stained weapon used in the massacre was obtained by DailyMail.com. 

A police officer and at least six others were injured in the broad daylight attack

New York City Mayor Eric Adams urged the public to ‘take proper safety precautions if you are in vicinity and do not go outside if you are near Park Avenue and East 51st Street’

Officers in protective gear were seen entering a building in midtown Manhattan on Monday following reports of an active shooter

FBI Deputy Director Dan Bongino said agents are responding to the scene.

New York Gov. Kathy Hochul said she has been briefed on the situation, and New York Attorney General Letitia James said she is ‘praying for our law enforcement and the New Yorkers impacted in the shooting situation this evening in Manhattan.’

NYC Mayor Eric Adams also arrived at the scene and said he would be visiting the hospital. 

This is a breaking news story and will be updated.