The parents of one of the 17 victims shot during an outdoor concert in Dallas in early April are suing the event organizer and others, claiming that the shooting was a “preventable tragedy.”

The shooting broke out at around 11:30 p.m among the crowd of an estimated 2,000 concertgoers. Officials detail that one individual fired a gun into the sky which prompted another individual to fire shots into the crowd. As the investigation into the shooting continues, police have not yet named a suspect.

As a result of the gunfire, 26-year-old Kealon Dejuane Gilmore, who was near the front of the stage, was shot in the head and reportedly died at the scene. Days following the shooting, the community gathered to mourn the death of Gilmore.

Michael and Gloria Rollerson, the parents of a 14-year-old girl who was also shot but survived after the bullet narrowly missed her femoral artery, claim that the tragedy was entirely preventable. While their daughter has since been released from the ICU, it is not yet clear whether or not she will be able to walk again.

According to the Dallas Morning News, the parents filed their lawsuit in Dallas County on behalf of their daughter and named 11 defendants including the church that owns the property where the concert was held, artists who performed, and event promoters.

The lawsuit contends that not enough was done to protect those in attendance. The family's attorney, Ryan Thompson, shared with local outlet NBC 5 that the event was held despite not having the proper permit in place and that the concert was advertised as a family-friendly event that would have ample police and security presence.

"In promoting this event, what they have promoted is that Dallas police would be on hand and that there would be upwards of 60 members of security teams, that you would have to go through a metal detector, no bags would be allowed, the kinds of things that you and I would expect to see at most events that we go to,” Thompson shared. Despite this, Thompson and the family detail that none of those promises were acted upon in the manner that was advertised.

In promoting the event, the organizers shared on social media that the concert would be “fun and safe” and that “ground rules” would be in place to maintain the safety and security of attendees. While promotional material detailed that Dallas police were hired to work the event, in actuality only seven off-duty officers were hired and they left at 11:00 p.m., 30 minutes before the shooting took place.

“The reality of what happened is there was little to no security, and the security that was there, the Dallas Police Department, left by 11 p.m.,” the family attorney shared. “The shooting happens afterward at an event that is uncontrolled, not fenced off, people are allowed to bring in whatever they want.”

The lawsuit is seeking to have all the defendants held accountable for their actions that led to the senseless death and injuries of concertgoers. The suit is also asking the defense to be held liable for medical costs and the trauma that their daughter endured as a result of the shooting.