A New York City police officer was shot to death early Wednesday, ambushed in a marked police truck and “assassinated in an unprovoked attack” by a man with a revolver who was later killed by officers, police said.

Officer Miosotis Familia, a 12-year member of the department, was wrapping up her shift when the man fired one round through the passenger-side window and struck her in the head. She was rushed to a hospital but did not survive.

“This was an unprovoked direct attack on police officers who were assigned to keep the people of this city safe,” Police Commissioner James O’Neill said, calling it an assassination.

Her partner radioed for help.

“Shots fired! 10-85!” the officer is heard frantically shouting after the gunfire, including the code for an officer down. “My partner’s shot! My partner’s shot! My partner’s shot! Hurry up central!”

Officers responded fast, and caught up to the suspect, 34-year-old Alexander Bonds, about a block away, police said. As they confronted him, he pulled a revolver, and police fired, striking and killing him. A silver revolver was found at the scene. A bystander was hit in the stomach by a bullet during the standoff and is in stable condition, police said.

Familia had been stationed in a mobile command post, a RV-sized truck used as a communications hub during major events, like the Fourth of July. She had been looking down, writing in her memo book, a police log where officers record their shift activity, when Bonds walked up.

Bonds, who also went by John Bonds, had been on parole for a robbery case in Syracuse, New York, but was from the Bronx, police said. He is seen in surveillance footage marching up to the post “with purpose,” officials said, but it’s not clear what provoked the attack.

In a video posted on Facebook in September, he ranted about the treatment of civilians by officers and talks about how hard life was behind bars. The photos of Bonds posted on the page match a police mugshot.

“Don’t think every brother, cousin, uncle you got that get killed in jail is because of a blood or crip or Latin King killing them. Nah, police be killing them and saying that an inmate killed them,” he said in the video.

The shooting recalled the Dec. 20, 2014 killing of patrol officers Wenjian Liu and Rafael Ramos, who were ambushed and shot to death in their vehicle without warning by a man who approached the passenger window of their marked police car. The suspect, 28-year-old Ismaaiyl Brinsley, then fatally shot himself. Brinsley announced online in the moments before the shooting that he was planning to shoot two “pigs” in retaliation for the police chokehold death of Eric Garner.

Mayor Bill de Blasio, speaking at the hospital before she died, asked that the city keep her in their thoughts.

“She was on duty serving this city, protecting people, doing what she believed in and doing the job she loved,” he said. “And after this shocking and sudden attack, her fellow officers came to her aid immediately.”

Officers saluted at attention outside the Bronx hospital as the ambulance and police motorcade escorted Familia’s body from the hospital. Familia had three children and had been a member of the anti-crime unit.

“Fully knowing the dangers that she faced, she suited up in uniform every day and stood tall against those who threaten and terrorize the good folks of the Bronx,” said Patrolman’s Benevolent Association president Patrick Lynch.

The Bronx neighborhood was blocked off with police tape as officers investigated the deadly shooting. Police were combing for any other surveillance footage and talking to witnesses.

Witness Jay Marzelli told the Daily News of New York he thought the shots Wednesday were fireworks at first.

“I was in this bodega right here on Creston, just getting a sandwich and all of a sudden there was all this running and stuff going on, and I look out probably 40, 50, 60 cops screaming, ‘Call a paramedic, clear the block!'” he said. “It looked like there was a riot going on, and two seconds later I hear gunshots, ‘Bam, bam,’ and then the police officer was just laying there.”

The following remarks were given by NYPD Commissioner James P. O’Neill:

A female police officer was shot and critically injured while sitting in a marked NYPD command vehicle near the corner of Morris Avenue and East 183rd Street in the Bronx around 12:30 a.m. The officer was assigned with a partner in a mobile command post when a suspect fired through the vehicle’s window striking her in the head. Her partner immediately radioed for assistance.

An anti-crime team, consisting of a sergeant and a police officer, who were in uniform, encountered a male subject running on Morris Avenue, approximately one block from the scene of the shooting. As they confronted him, he drew a revolver. The officers fired at him, striking and killing him. A silver revolver was recovered at the scene.

We are in the process of confirming the identity of the deceased subject.

During the encounter with the suspect, another individual, believed to be a bystander, was struck by a bullet. That person is in stable condition.

The female officer was transported to Saint Barnabas Hospital, where she is listed in extremely critical condition. I want to thank the medical staff here at Saint Barnabas Hospital for their efforts. Further details will be available when they become available. We are conducting an extensive search for video at the crime scene.

Based on what we know now, it is clear that this was an unprovoked direct attack on police officers who were assigned to keep the people of this city safe.

(AP)