It is reported by NBC with reference to the Italian police.
It is noted that law enforcement officers interviewed dozens of witnesses to the incident after visitors to the concert at the club reported a teenager who sprayed gas indoors.
Earlier it became known that the victims of the crush, which occurred at a rap concert in Ancona, were five minors and a woman, dozens suffered.
According to eyewitnesses, panic caused a strong smell in the club, the source of which could be gas from a can.