Philadelphia District Attorney Seth Williams has established a new group within his office that will exclusively handle the review of cases with “legitimate” post-conviction claims of innocence.

During a press conference Tuesday at the Philadelphia District Attorney’s Office, Williams announced the creation of the Conviction Review Unit (CRU), led by homicide prosecutor Mark Gilson, to investigate claims of innocence stemming from homicide and other serious cases. Williams said his office looked to the Pennsylvania Innocence Project for input on the unit’s development.