Electric Zoo Festival deaths of two people that were believed to be caused by drugs have caused a cancellation in the event at Randall's Island in New York.

The two deaths of the attendees of the Electric Zoo Festival forced the organizers of the event to shut down its final day on Sunday in New York City. What caused their deaths were possibly MDMA or ecstasy, according to the New York Police Department.

The Electric Zoo Festival is also known as E-Zoo. It is an annual electronic music festival held over Labor Day weekend in New York City's Randall's Island since 2009. Its popularity has increased every year, though there has become a stigma of popping pills, which could have caused the deaths of two patrons.

"The City recommended cancellation and the event promoters have agreed," the NYPD and Mayor Michael Bloomberg's office said in a joint statement. "The Electric Zoo organizers have worked with City officials to reduce health risks at this event, but in view of these occurrences, the safest course is to cancel the remaining day of the event."

It is an event that features some of the most famous DJs from around the world. Some of the notable names from this year's Electric Zoo festival were Avicii, David Guetta and Diplo. Scheduled to perform Sunday were DJs Armin Van Buuren, Sebastiona Ingrosso, Steve Aoki and Laidback Luke.

The cancellation was announced in a brief statement on the festival website.

"The founders of Electric Zoo send our deepest condolences to the families of the two people who passed away this weekend," the statement said. "Because there is nothing more important to us than our patrons, we have decided in consultation with the New York City Parks Department that there will be no show today."