The third day of a New York City music festival was canceled today after two concertgoers died of suspected drug overdoses and four others became very ill, reports the New York Times. The city cited "serious health risks" at Electric Zoo, held over Labor Day weekend at Randalls Island, and the event's promoters agreed, posting a statement extending their "deepest condolences to the families of the two people who passed away" and saying that "because there is nothing more important to us than our patrons, we have decided that there will be no show today." Mayor Michael Bloomberg's office said the deaths appeared to involve MDMA—aka ecstasy or molly—though official causes of death are pending. Some 125 acts were to perform at Electric Zoo, including Avicii, David Guetta, and Krewella. (More Electric Zoo stories.)