The concert began at 11:00 a.m. Thursday at the Susquehanna Bank Center and continued into the evening.
Paramedics had a busy day responding to medical calls at the concert. Cooper University Hospital set up special medical tents at the event to help deal with heatrelated issues. At last count, over 195 people had to be treated; at least four had to be transported by ambulance to Cooper's emergency room.
At the concert site, medics could be seen attending to some of those who were stricken, while others were doused by the water from a fire hose.
Action News caught up with some people who were leaving early because of the heat.
"It was really hot but they had a lot of water and everything," said concert-goer John Riley of Marlton, who added he saw some people fainting.
"It's really, really hot and there are a bunch of people so with all the people the body heat everyone sweats and stuff," said concert-goer Jessica Halter of Buena.
The website for the Vans Warped Tour 2011 said attendees were allowed to bring one sealed or empty water bottle and that water fountains would be available on-site.