A Detroit inmate is on the run after stabbing a cop and holding another deputy briefly hostage, the Detroit Free Press reports. The inmate fled the Frank Murphy Hall of Justice Courthouse, where the attack occurred, Fox 2 and ABC 7 report. The man, identified as Derek White, 25, stole a van, which was later recovered in a vacant lot. Police say he took the hostage's uniform but is now thought to be wearing a white T-shirt and gray pants. He's believed to be armed and dangerous.