Four people were injured and one person died after a shooting in Northwest Washington DC on Thursday morning, local police said.

In a Thursday afternoon press conference, law enforcement identified the suspect as 55-year-old Matt Wade Lambert, who died from a self-inflicted gunshot wound.

Earlier Thursday, the police said that the shooter had a “conflict between him and the homeowners association of that building”. Court records show that Lambert had been involved in a civil dispute with the association since March 2025, alleging that his unit had mold, moisture issues and water damage after repairs to the building’s facade. The association denied allegations of negligence in court filings, and the litigation remained ongoing.

Law enforcement identified the victim as 46-year-old James Stuart, the building manager for the VIDA Fitness gym in Lambert’s building, where he allegedly fired his handgun. After leaving the gym, Lambert continued firing from his apartment patio, law enforcement said.

Two men and two women were injured and were transported to the hospital, law enforcement said. Among those who were transported, one is “determined to be in critical condition” and the others have non-life threatening injuries.

Jeffery Carroll, the interim chief of police for the Metropolitan police department (MPD), told reporters earlier Thursday that the department received a report of a shooting just before 8am ET at the 1500 block of 15th Street inside of a gym. He said officers were dispatched to the area and were on the scene within 30 seconds.

“When officers got on the scene, they began canvassing, attempting to locate the suspect in this case,” Carroll said. “While they were on the scene, they were able to begin to clear the building where the shootings occurred.”

While clearing an apartment building on the block, Carroll noted that “gunshots rang out on the seventh floor, and since that time, we have determined the suspect had barricaded themselves in an apartment on the seventh floor of that building”. The emergency response team “responded to the scene as well as additional resources from many federal partners”. Lambert was found to have three firearms, he said.

Lambert also broke a gas line in the apartment and started a fire, law enforcement said.

“Our negotiators with their emergency response team were also able to make contact with the suspect inside the apartment,” Carroll continued. “They’ve been talking to him for over the past hour, again attempting to try to resolve the situation. Just moments ago, while communicating with that individual, officers heard a gunshot. As a response to that, officers forced entry into the apartment. When they did that, they located the suspect suffering from a gunshot wound.”

Police are “still evaluating that to make sure we clear the entire building”. They also noted later on Thursday morning that the scene was “safe” but that the public should still “avoid the area”.

Brooke Pinto, a DC council member, told Fox 5 DC that the suspect had been in “litigation recently with his building owner and we believe the suspect went into VIDA Fitness to target that building owner to shoot him and kill him, which he did, and it’s just an awful, unacceptable situation that something that could be resolved led to a murder … It’s just outrageous.”

The “suspect then left VIDA and shot others outside, several construction workers, a woman, we don’t know if those were randomized shootings, as he may have been trying to flee the scene, then went back into the apartment building and a barricade was around him, he set parts of the building on fire, and I just want to thank our first responders and our SWAT teams”, Pinto continued.

Pinto confirmed that the suspect “shot himself” and is “now dead”.

Muriel Bowser, the mayor of Washington DC, called the shooting a “senseless act of gun violence” at the news conference and confirmed that the White House had been briefed.

Janeese Lewis George, the city’s mayor-elect, called the shooting “horrifying” and offered her “sincere condolences to all the victims, their families, and DC residents living through this fear”.

VIDA Fitness DC confirmed in a statement on social media that its Logan Circle location was “temporarily closed” following the shooting and that it will remain closed until further notice.

“The safety and well-being of our members, guests and team are our highest priority,” it said. “We ask that you avoid traveling to the Logan Circle location and surrounding area until further notice.

“Our thoughts are with everyone affected by this incident,” the statement added. “We understand that this news may be deeply concerning to our VIDA community.”

A witness to the shooting, 23-year-old Anthony Mirones, said he had gone to VIDA Fitness in the morning and was on the treadmill when he heard the first loud “bang” at about 8am and saw a man lying dead on the floor with blood nearby.

“Everyone’s confused. I’m confused,” Mirones said. “Did the painting fall?”

He went toward the noise and saw someone on the ground. A person standing closer to the body looked back and told him the man was dead.

“So I come a little closer and I see a body on floor, some blood,” Mirones said. “I’m thinking about the loud bangs. I’m like, ‘Gunshot.’”

Outside, at the entrance, police officers rushed in. “One police officer unholsters his gun, and then another police officer is asking for a description of the assailant,” Mirones said. “While [another witness] is describing the assailant, we hear five or so gunshots, and then we just all scatter and run.”