Published: May 27, 2010 4:31 PM EDT
Updated: May 27, 2010 1:32 PM EDT

GAINESVILLE, Fla. (AP) - Two guards have been suspended as Florida authorities continue investigating what caused a 20-year-old inmate to collapse during ordered exercise drills at a prison for youths near Trenton.

Corrections Secretary Walter McNeil on Thursday placed the Lancaster guards on administrative leave due to conflicting witness statements.

Gov. Charlie Crist's office also has asked the Florida Department of Law Enforcement to investigate what happened to Samuel Dread, who was in critical condition after being placed in a medically induced coma.

A letter to the agency from one of Crist's lawyers says there are questions whether Dreead was taking medication that required him to avoid extreme temperatures. It was 86 degrees when he collapsed Monday, shortly after arriving at the facility.