BOSTON — A man armed with a sword slashed a Boston police officer's arm, sent a mental health clinician crashing to the ground, and left several other first responders bloodied inside an apartment building steps from Northeastern University on Friday morning.

The suspect — who had called 911 himself, claiming four gunmen were coming to kill him — was shot dead by officers after the attack. He had been spoken to through a closed door for 45 minutes before he swung.

Forty-five minutes. Of talking. Through a door. To a man with a sword.

And within hours, the Boston Police Patrolmen's Association made clear who they hold responsible — not the man with the blade, but the man behind the desk at the Suffolk County DA's office.

"The overzealous DA should take a bow now that cops are waiting to get stabbed before taking steps to protect themselves," the BPPA wrote.

That DA is Kevin Hayden. And this isn't the first time his name has come up after a cop got hurt.

It started at 10:44 a.m. A 911 call from 212 Hemenway Street — a residential building in the Fenway, surrounded by student housing. The caller said four armed people were trying to get into his apartment and wanted to kill him.

Officers arrived. Nobody in the hallway. No threat. Just a man behind a locked door, clearly in crisis.

They called in a Boston EMS mental health clinician. The clinician spoke with him for the better part of an hour. Patient. Professional. By the book.

Then he opened the door with a sword in his hand.

He hit the clinician first. Then he drove the blade into the officer's arm. Other officers fired a taser and their weapons. The man went down. He was given medical attention on scene, rushed to a nearby hospital, and pronounced dead.

The officer got a tourniquet at the scene. Several other officers and two EMS clinicians were also taken to hospital with non-life-threatening injuries.

"Members of Boston EMS show up to save lives — not to be assaulted," Boston EMS said in a statement. "No one should face violence simply doing their job."

Police Commissioner Michael Cox confirmed the weapon was "some sort of sword." The suspect's identity has not been released.

The BPPA's fury has a date stamped on it: March 20, 2026.

That's the morning DA Kevin Hayden sent officers to arrest Nicholas O'Malley — a 33-year-old cop with an unblemished record, a wife, a toddler, and a six-month-old baby — at his front door. Not allowed to turn himself in. Grabbed at his doorstep. Paraded into court.

It was the first time in 30 years a Boston cop had been charged with manslaughter for an on-duty shooting. Sixty officers packed the courthouse. A GoFundMe hit $200,000. The union called for someone — anyone — to run against Hayden.

The message to every officer in the city was unmistakable: use your weapon on a violent criminal and this DA will destroy your life.

Two weeks later, a man with a sword opened a door and attacked two cops. The officers on the other side of that door had spent 45 minutes talking.

Northeastern's police chief told the campus there was "no threat or concern."

Then two cops got attacked with a sword.

There's a detail in all of this that nobody seems eager to talk about.

A 2% raise and a gym membership. That's what the union got for backing a mayor who would later thank the man prosecuting one of their own. The BPPA's post on Friday didn't just attack Hayden. It attacked the entire framework they helped put in power. That kind of rage doesn't come from a union that feels like it got a good deal.

Wu has not commented on the sword attack or the union's statement.

Two officers are injured — one with a sword wound. A suspect is dead. A mental health clinician was knocked to the ground. And the police union says the man responsible isn't the one who swung the sword — it's the one sitting in the DA's office.