(CNN) -- Dozens of concertgoers were hospitalized during a show by superstar DJ Avicii in Boston on Wednesday night, CNN affiliates reported. 
 
 Local media put the number of patients anywhere between 30 and 80. 
 
 Massachusetts General Hospital told CNN it received 13 patients between ages 16 and 19. All of the patients are being evaluated, said Kory Zhao, a hospital public affairs officer. 
 
 Most patients had a problem with dehydration, drugs and alcohol, authorities told CNN affiliate WHDH. 
 
 Avicii, the Swedish artist behind the hit song "Wake Me Up," performed at the TD Garden as part of his True Tour. 
 
 Dozens of ambulances lined up outside the garden venue as crowds spilled into the streets after the concert. Other ambulances zoomed off, red lights flashing, as frazzled parents waited. 
 
 "I have a 15-year-old and her girlfriend that came to the Avicii concert ... we just heard about this, " Pam Jones told WHDH. "I'm very shocked. We have to find her." 
 
 Chanel Andre, who also attended the concert, said the venue was hot. 
 
 "These concerts should be outside ... I think it was a combination of heat and drugs, more of the latter," she said. 
 
 The artist, whose real name is Tim Bergling, became an international star as a DJ and producer in electronic dance. 
 
 His other hit songs include "Hey Brother" and "Levels," which was nominated for a Grammy for Best Dance Recording last year. 
 
 This is the latest incident involving concertgoers. 
 
 A man collapsed and died after leaving the Electric Daisy Carnival in Las Vegas on Saturday morning, the Las Vegas Sun reported. Avicii was on the schedule of performers at that festival. 
 
 It's unclear whether his death was linked to the festival. An investigation is under way. 
 
 Police told the newspaper that nearly 800 people were treated for medical conditions, 25 of whom were transported to local hospitals. 
 
 About 400,000 people attended the Las Vegas music event during its three-night run, the paper said. 
 
 Avicii cancels Ultra Festival performance to undergo gall bladder surgery 
 
 Electric Zoo music festival canceled after 2 deaths blamed on drugs 
 
 10 indicted in deaths at 201 Love Parade music festival in Germany 
 
 CNN's Tina Burnside contributed to this report. ||||| TD Garden cited after 80 receive medical treatment Posted: Wednesday, June 25, 2014 10:54 PM EDT Updated: Wednesday, August 6, 2014 10:55 PM EDT Posted:Updated: 
 
 TD Garden has been cited following a mass medical emergency that included more than 80 people during the Avicii concert Wednesday night. 
 
 
 
 50 of those people were treated by paramedics at the Garden. Another 36 people had to be taken to local hospitals. 
 
 
 
 "There was a lot of drinking and some drugs. It was really hot in there," a concert-goer said. 
 
 
 
 Boston Police issued citations for intoxicated patrons and patrons consuming drugs on the premises. 
 
 
 
 The Suffolk County District Attorney's office said that three men were arrested near the TD Garden. Each is facing drug charges and is expected to be arraigned Thursday. None have been linked to the hospitalizations. 
 
 
 
 A video posted online shows a person being looked at by officers. 
 
 
 
 "Everyone was having a good time but then when we left there was ambulances and police officers," a concert-goer said 
 
 
 
 Boston EMS says none of the patients they saw were in serious condition, but dozens of ambulances were called to the concert shortly after it began at 8 p.m. 
 
 
 
 "Mostly heat and alcohol related symptoms. There was a lot of underage drinking tonight and some illicit drugs. However, we can't identify anything specific," Boston EMS Deputy Superintendent Michael Bosse said. 
 
 
 
 By the time the show ended at 11 p.m. a staging area had been set up on Causeway Street. 
 
 
 
 "A good amount of people were under the influence of drugs. A lot of ambulances showed up to take away people who were not okay to stay at the concert," a concert-goer said. 
 
 
 
 Concert promoter Live Nation says most of the people taken to the hospital were stopped before going in to the concert. 
 
 
 
 Avicii, a Swedish disc jockey, posted a tweet online saying he hopes everyone is okay. 
 
 
 
 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. 
 
 
 
 — Tim Bergling (@Avicii) June 26, 2014 
 
 
 
 Officials say heavy alcohol consumption at a concert like this one is all too common. 
 
 
 
 "When you have this type of a concert, this techno-rave type thing, we kind of know it may be coming," Bosse said. 
 
 
 
 "People go overboard, so I think this is what they did, they just went overboard," a concert-goer said. 
 
 
 
 Boston EMS said most of the patients they saw were between the ages of 16 and 25-years-old and no injuries were serious. 
 
 
 
 TD Garden released a statement, saying that it is taking the incident "very seriously." 
 
 
 
 "We implemented increased precautions such as restricted alcohol sales, additional security and provided two cooling off areas for guests, in addition to the building maintained at normal temperature," the statement said. 
 
 
 
 Commissioner Evans and Mayor Walsh are looking to meet with TD Garden officials next week to discuss the incidents. 
 
 
 
 “If the young people were allowed in there intoxicated that should not be happening. It’s my understanding they did detain some kids going in and call their parents; I don’t know if it’s before or after. It’s hard to say be prepared, kids shouldn’t be drinking alcohol,” Mayor Walsh said. 
 
 
 
 Officials say the TD Garden has been cited five or six times in the past few years for various issues. They say that number isn't unusual for an entertainment venue of any size. 
 

– 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."