ANAMOSA, Iowa (AP) — Authorities say an inmate head-butted a guard at the Anamosa State Penitentiary in eastern Iowa. The attack occurred around 6:40 p.m. Sunday. The Iowa Corrections Department says the inmate also bit one of the officer’s forearms. Other officers soon restrained the inmate. The guard was assessed and returned to duty, but later he was taken to the Jones Regional Medical Center in Anamosa, where he was diagnosed with a concussion. The names of those involved have not been released.