NEW YORK — NYPD Officer Didarul Islam, the cop gunned down in a Midtown Manhattan mass shooting inside a Park Ave. office building, was posthumously promoted to detective first grade during his funeral on Thursday as a sea of mourners, mostly police, gathered outside to pay their respects. An estimated 15,000 people were on hand.

Islam was one of the four people killed on Monday by rampaging gunman Shane Tamura in what police Commissioner Jessica Tisch called a “self-centered, senseless crusade of violence,” as she announced Islam’s promotion.

“(Tamura) tore a father from his children, a husband from his wife, a son from his family, and, in that moment, he ripped the world away from everyone who knew and loved NYPD Police Officer Didarul Islam,” Tisch said. “His journey was cut too short. But the way he lived this job — with steadiness, with heart and conviction — he reflected everything this title represents.”

Islam’s father, Abdur Rob, suffered a minor heart attack after rushing to New York-Presbyterian Hospital Weill Cornell and being told that his son had not survived the 6:30 p.m. bloodbath.

On Wednesday night, Mayor Eric Adams visited with Islam’s family and spoke with Rob and other family members.

“There is nothing more tragic than having a parent bury their child,” Adams said at the funeral Wednesday. “The pain is so immense. It is so intense, and we (are) thinking about it over and over again.”

The mayor said that talking to Rob made him think about his own son: “I want to say sorry as one parent to another parent. We must live in the spirit of Officer Islam and what he stood for.”

Adams and Tisch also went to the 47th Precinct stationhouse where Islam worked on Wednesday to attend morning roll call and talk to cops mourning their colleague’s death.

Islam had been a cop since 2021. He was in uniform working a paid security detail in the building at E. 51st St., which had been authorized by the NYPD, when Tamura stormed inside with an assault rifle and started firing, hitting him repeatedly in the torso.

Tamura, a resident of Las Vegas, also killed building security guard Aland Etienne, 46, and Blackstone executive Wesley LePatner, 43, in the lobby. He then took an elevator to the 33rd floor where he killed Julia Hyman, 27, and shot at but narrowly missed hitting a fleeing cleaning woman, before taking his own life.

In all, he fired more than 40 shots from a high-powered AR-15 assault rifle, littering the lobby and 33rd floor with bullets and blood, NYPD Chief of Department John Chell said Wednesday.

“I’ve been doing this 32 years,” Chell said, getting choked up at times during the interview on Fox 5’s “Good Day New York.” “Just getting there on that scene and realizing you had casualties and there was an active shooter going on. This is not a normal event.”

“We lost four great New Yorkers,” he added. “They didn’t deserve this. This was pure evil. Senseless.”

Speaking to other pressing issues of the day, the imam overseeing the service challenged police, local elected officials and mourners to rid the world of Islamophobia and end the war in Gaza.

“Do not stand with him in death, stand with his people in life,” Imam Zakir Ahmed told an overflow crowd at the Parkchester Jame Masjid mosque as he prayed for Officer Islam, a Bangladeshi immigrant, loving husband and father, and dedicated police officer. “He lived at a time when, too often, people like him are feared. You cannot take our sacrifice but ignore our suffering.”

“We commit ourselves to not just to honor him, but to building a world worthy of his sacrifice,” he said. “A world where freedom is for all, not for some.”

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