A burst of gunfire at an 18-year-old girl's birthday party left two dead, another two critically injured and dozens hurt in a chaotic scene where people jumped from second-floor windows to escape the shooting in Houston in Texas, ABC News reported on Sunday. More than 100 people, mostly 17- to 19-year-olds, had gathered at the home in Cypress, the Harris County Sheriff's Office said. Partygoer Shaniqua Brown said it "was not rowdy at all," and many people were dancing when they heard the shots, which police said were fired between 11:30 p.m. and midnight. Authorities say they're seeking two gunmen. A man and woman died — one at the scene and another at a hospital. They have not been identified by name. As many as 22 were hurt, with injuries ranging from gunshot wounds to twisted ankles by those fleeing in panic. Sheriff's spokesman Thomas Gilliland said Sunday authorities are still trying to determine the condition for many of the injured.