Boston bombing suspect Dzhokhar Tsarnaev has been moved from a hospital to a prison medical center in Massachusetts, a US marshal's spokesman told CNN Friday.

Tsarnaev was sent to the Federal Medical Center Devens, about 40 miles (65 kilometers) northwest of the Boston-area hospital where he has been convalescing since he was injured in a shootout with police last week, days after the bombing which killed three and wounded 264.