Nashville youth detainees attempt prison break twice
4 September 2014 Last updated at 15:35 BST
Six teenagers remain on the run from a juvenile detention centre in Nashville, Tennessee, after two prison breaks in a week.
Around 30 detainees, aged between 14 and 19, escaped under a fence from Woodland Hills Youth Development Center on Monday.
Footage from the early hours of Thursday shows detainees attacking prison guards in the yard while attempting a second escape.
Nomia Iqbal reports.