welcome to sunday. this is cnn this morning. i m victor brach well. i m amara walker. we begin in allen, texas, where at least eight people have been killed in yet another mass shooting in america. authorities say a gunman opened fire at an ultioutlet mall nort dallas as hundreds of people were, of course, shopping. footage from a witness dashcam shows the moment the gunman got out of his star and started shooting. we are pausing this before the shooting starts. another witness recorded as people tried to get away from the attacker and we are going to play this now, but we warn you it may be hard to watch. you see people there running. of course, you can hear the gunshots. police say that an officer responded and killed the shooter. here is how the mayor of allen reacted. allen is a proud and safe city which makes today s senseless act of violence even more shocking. however, i want to commend our police and fire departments for their quick response. their thorou