A $10,000 reward is being offered for information leading to the identification, arrest and conviction of Philadelphia man believed to be a member of an armed gang that struck two jewelry stores in Michigan.

Four members of the gang, all Philadelphia men, are already in custody for armed robberies in the Detroit area. David Briley, Shaheed Calhoun, Orlando Johnson and Nathaniel Pembrook are charged in the April 22 robberies of Medawar Jewelers in Grand Rapids and Tapper's Diamonds and Fine Jewelry in West Bloomfield.

The FBI is also searching for an additional Philadelphia man believed to have been involved in the crimes. Anyone with information is asked to contact the FBI's Detroit Field Office at 313-965-2323 or https://tips.fbi.gov.