A Dallas Cowboys watch party in Texas turned deadly Sunday night when seven people were gunned down in cold blood by a man who barged in with an automatic weapon, reports say.

The shooter, who was later killed by police, had been arguing with a woman outside the Plano home where the gathering was taking place before he allegedly went inside and started blasting, according to witnesses.

“I seen a man argue with a woman. They were standing outside and they’re arguing,” local resident Crystal Sugg told FOX 4.

“The woman was trying to go back in and as she was going back in the house, you seen the man pull out his gun and starting just releasing,” she said. “He just started letting them go. It was an automatic. You could hear it go off multiple times, you could hear it just ring off.”

Several men who were at the residence for the Cowboys-vs.-Giants watch party — and had just left to go to a bar — told FOX there were a number of people still inside the house when the man burst in and opened fire around 8 p.m.

Authorities from Plano, a suburb north of Dallas, rushed to the scene after receiving reports of multiple gunshots and found seven partygoers dead and two others wounded.

An officer who entered the home “engaged the suspect,” shooting and killing him after he reportedly took aim at the cop.

“I’ve been here all my life,” Plano police spokesman David Tilley told the Dallas Morning News. “I’ve never heard of anything like this.”

Witnesses reported hearing 30 to 40 shots coming from the house during the shooting. It is not clear, though, if this included the bullets being fired by police officers.

“My neighbor had already heard the first couple of shots, and we came outside and next thing you know, all you heard was like, pop, pop, pop, pop, pop, pop, pop, pop,” Steven Featherland told FOX.

“It was like 30 to 40 rounds,” he said. “That’s when we both went inside.”

Police have not given a motive for the shooting or confirmed the details about the Dallas watch party. But several people have said they were either in attendance or knew someone who was.

“We’re trying to put all the puzzle pieces together,” Tilley said.

Sugg told FOX that she was one of several residents who saw the suspect arguing with the woman before the shooting unfolded.

“The argument is what brought me outside,” she said, adding that others came out to see what was happening.

“The argument was about a good 10 minutes,” Sugg explained. “You could hear it getting really, really loud. You could tell it was getting disturbing, like there was something about to happen. It caused people to come outside.”

Suggs recalled how partygoers appeared to be trapped inside the home, like fish in a barrel.

“I heard a lot of screaming,” she said. “A lot, a lot of screaming … Nobody was running … All you heard was just shooting. Just shooting. Just boom, boom, boom, boom, boom, boom, boom, boom.”