The Canadian dubstep duo has their Philadelphia concert cancelled before it even starts.

According to Philly.com (via Beatport), the DJ duo’s Saturday show at Philadelphia’s Electric Factory was cancelled because at least four (and as many as nine) people had overdosed on an unidentified drug. Unconfirmed reports say the people who passed out were mostly teens, with some as young as 15.

A statement by the unfortunately named Deathwaltz Media Group, one of the marketing companies the Electric Factory hired to promote the event, described the news of hospitalizations as “very sad,” and said it hoped “that everyone can learn from this and start enjoying these types of concerts without the use of drugs.” The Electric Factory has not commented, and police had no information about a possible investigation.

It has been a rough year for electronic music shows, between stabbings at Swedish House Mafia gigs and a fatal crowd rush after a Steve Aoki show, among other incidents.