Texas Party Shooting Update: Victims' families offer reward for information in fatal shooting

(CBS) HOUSTON - The families of two victims are offering $2,000 for information on the house party shooting that left their loved ones dead and 18 others injured, according to CBS affiliate KHOU.

PICTURES: Victims of the Texas birthday party shooting

Arielle Shepherd and Qu'eric Danariu Richardson, both 17-year-old students at Morton Ranch High School, were killed Saturday night when people attending a birthday party opened fire into the crowd after a single celebratory gunshot created confusion.

The families held a press conference Wednesday and asked the Harris County Sheriff's Department to do a better investigation, according to KHOU.

Two suspects have been arrested in connection with the shooting, one of them was later released.

Randy Stewart, 18, still faces a charge of aggravated assault. He reportedly denies shooting and says he also panicked when the fire broke out, just like everyone else. 

Investigators say the shooting may have been the result of a dispute between multiple gangs.

The gunfire prompted party-goers to flee for their lives through second-story windows, authorities said Sunday.

The event was promoted openly on several social media sites and drew more than 100 people, most of them 17- to 19-year-olds, police said.

After giving varying reports of how many people were injured, authorities clarified Sunday that 20 people were hurt, including 16 who were wounded by gunfire - two critically - and four others who suffered injuries while trying to flee.