Eight people were fatally shot and two others critically wounded at a Dallas Cowboy viewing party in Plano, Texas Sunday night.

KDFW reports that a man killed 7 people and critically wounded 2 more before police shot him dead. Investigators were still working to determine a motive for the attack Monday morning.

A neighbor who lives behind the house described what she heard:

“We were watching the Cowboys game and we heard gunfire. And my son was out on the patio. I jumped up, went outside, smelled the gun smoke or the residue from the gunfire. I told the boys to come back in and heard another round of gunfire. It was really scary.We just came in. You know, we just didn’t know if there was still another shooter and we could see the cops looking up and down the alley. So I just wanted to make sure all the doors were locked and that somebody wouldn’t run to our house and try to come in.”