Police told the newspaper that nearly 800 people were treated for medical conditions, 25 of whom were transported to local hospitals. I think it was a combination of heat and drugs, more of the latter," she said. Chanel Andre, who also attended the concert, said the venue was hot. It's unclear whether his death was linked to the festival. Concert promoter Live Nation says most of the people taken to the hospital were stopped before going in to the concert. Boston EMS said most of the patients they saw were between the ages of 16 and 25-years-old and no injuries were serious.
– By the time an Avicii concert at Boston's TD Garden ended around 11pm last night, a staging area had been set up nearby to deal with all the concertgoers requiring medical attention—a total of more than 80, about 50 of whom were treated by paramedics at the scene and 36 of whom were hospitalized. "There was a lot of drinking and some drugs. It was really hot in there," one attendee explains to WHDH. An EMS official confirms they mostly saw "heat- and alcohol-related symptoms," and none of the patients were in serious condition. Still, dozens of ambulances were called. "Everyone was having a good time but then when we left there was ambulances and police officers," another concertgoer says. Another adds, according to CNN, "These concerts should be outside ... I think it was a combination of heat and drugs, more of the latter." But Live Nation, the concert promoter, says most of the people hospitalized were actually stopped before entering the venue. "When you have this type of a concert, this techno-rave type thing, we kind of know it may be coming," the EMS official explains. Avicii tweeted afterward, "Just hearing the awful news abt tonight. Its a terrible thing, I rly hope everyone is ok! My thoughts go to those affected & their families."