Published: Feb 04, 2013 5:30 PM EST

FORT MYERS, Fla.- On Friday, a federal jury found 33-year-old Michael James Harrell, 27-year-old Matthew Rollins, and 28-year-old Maurice Andre Colbert guilty of armed bank robbery, possession of a firearm during a crime of violence, attempted bank robbery, conspiracy to commit armed bank robbery and conspiracy to use firearms during a crime of violence in relation to a series of bank robberies, in Lee County, during the summer and fall of 2011.

Harrell faces a mandatory minimum term of imprisonment of 57 years, up to life in federal prison. Both Rollins and Colbert face a mandatory minimum term of 32 years imprisonment, up to life and 7 years imprisonment, up to life, respectively.

Sentencing hearings for all three individuals are scheduled for May 2013.

According to the evidence presented at trial, the three men and another co-conspirator conspired to rob area banks with firearms from June 6, 2011 to October 8, 2011. In addition to the conspiracy charges, the jury found Harrell and Rollins guilty of armed robbery and related weapons charges for Wells Fargo Bank and Preferred Community Bank in Lehigh Acres, in August 2011. Harrell and Colbert were also found guilty of the same offenses against Lee County Postal Employees Credit Union in June 2011. All three men were convicted of the attempted robbery of the Wells Fargo Bank in Bonita Springs, on September 14, 2011 and Capital Bank, in Fort Myers, on October 4, 2011. Harrell and Colbert were also convicted for the attempted robbery of Fifth Third Bank in Fort Myers, on October 7, 2011.