A 14-year-old child was among eight people killed following a crowd surge at a music festival in Texas during a performance by rapper Travis Scott.
A 16-year-old also died in the disaster at Astroworld Festival in Houston on Friday, the city’s mayor Sylvester Turner said.
The other victims included two 21-year-olds, two people aged 23 and a 27-year-old, while the age of one victim is unknown.
Twenty-five people were admitted to hospital and 13 are still receiving treatment, including five under the age of 18.
BREAKING: A 14-year-old was among eight killed at Travis Scott's festival performance, Houston Mayor Sylvester Turner has confirmed.
Mr Turner added that a "very, very active investigation" was taking place and could go on for "quite some time".https://t.co/l1FJepJ2cq pic.twitter.com/APAqn5spfc
Appearing at a news conference on Saturday, Mr Turner said it was “a tragedy on many different levels” and that it was too early to draw conclusions about what went wrong.
Houston Police Chief Troy Finner confirmed that during the concert a member of security passed out after appearing to be injected in the neck by a concert-goer.
He added that the security officer was revived with several doses of Narcan, a prescription drug used for the treatment of suspected opioid overdoses.
Travis Scott ‘absolutely devastated’ after eight people killed in crowd surge at Astroworld Festival show in Texas
Travis Scott asks security to ‘help real quick’ after spotting collapsed crowd member at Astroworld festival
Eight killed in crowd surge during Travis Scott concert at Astroworld Festival in Texas
"The events of last night were tragic beyond belief".
Harris County Judge Lina Hidalgo says it 'breaks her heart' to know that most of the victims of the crowd surge at Travis Scott's concert were under the age of 27, the youngest being 14-years-old.https://t.co/Ej4VPXOzTa pic.twitter.com/7CiXz3m4eC
Officials declared a “mass casualty incident” during Scott’s headline performance at the festival on Friday night.
Some of the 50,000-strong crowd “began to compress towards the front of the stage” while the rapper was performing on the opening night, authorities said..
Scott, who founded the festival, stopped multiple times during his 75-minute set after spotting fans in distress near the front of the stage, and asked security to help people out of the crowd.