At a Boston Avicii concert, over 50 people were treated by EMS and 36 other patients were transported to nearby hospitals.  According to the Boston Globe, most of the issues were minor.

Authorities say that the problems were mostly drug and alcohol related.

No specific drugs have been identified.  In May, a similar situation occurred at a Toronto Avicii concert.  In other stories, Molly is often the drug that gets the most press.

One concertgoer told the Globe that most of the attendees were high school aged.  

Mike Santostefano said, "People who don't do drugs come here and do drugs."