Dozens of people were injured when a fence collapsed at a Snoop Dogg and Wiz Khalifa concert in Camden, New Jersey.

Camden police said the injuries included broken bones, bruises and bumps and that more than 40 were injured in total. Concert staff were among the injured.

Video shows the guard railing give way and hundreds of people toppling forward. The rappers' backs were turned at the moment the accident happened and did not notice right away.

Both wished their fans well on Twitter.

Watch witnesses describe the terrible accident to Fox News below.