A Council Bluffs-area man has died after collapsing at a Slipknot concert in Council Bluffs. Twenty-nine-year-old Cory Nickels collapsed on the concourse of the Mid-America Center Sunday night.

Friends say that Nickels was not feeling well when the concert ended around 10:30. After he collapsed, emergency medics performed CPR and then he was rushed to a nearby hospital where he died.

Nichols suffered a heart attack and friends say his family had a history of heart problems. Council Bluffs authorities say about 30 people were treated for injuries during the concert, most related to mosh pit dancing.