Authorities are expanding the investigation, considering the possibility of drug crimes involved in the death of at least eight people at a concert hosted by American hip-hop star Travis Scott.
According to Fox News and others, investigative authorities believe that someone in the attendees may have injected drugs into another person, so they dispatched murder and drug crime investigators.
On the 5th, 50,000 fans attended Scott's concert 'Astro World Music Festival' in Houston, Texas.
At the time, excited audiences rushed toward the stage, crushing eight people and injuring hundreds.
Houston Police Chief Troy Finner said an investigation was launched into a murder and drug crime, as there were reports of someone in the audience injecting drugs into others.
According to police, one security guard fell unconscious after feeling a tingling in his neck while controlling the scene at the time of the accident, and several spectators suffered similar situations.
They were given first aid with a drug antidote and regained consciousness.
Houston investigators made 25 arrests at the scene of the accident, including marijuana possession, drug addiction and trespassing.
In addition, more than 300 people were treated on the spot for drug overdose and injuries.
The victims of the crushing accident were 14-year-old and 16-year-old Houston high school students, as well as 21-year-old college students.
One person has not yet been identified.
The police have also launched an investigation into the concert organizers' compliance with safety regulations.
In a video statement posted on Twitter, Scott bowed his head, saying, "I was not aware of the seriousness of the situation at the time of the concert."