Sheriff Dean Roesler said an inmate attacked two deputies near a second-floor housing unit at about 3:45 p.m. Terry Raap, 26, attacked the deputies with weapons made from Plexiglas and pieces of concrete placed in a sock, Roesler said.
The attack was without warning and without provocation, according to authorities.
The injured deputies are 25-year and 19-year veterans of the county corrections unit.
Raap has been a prisoner at the Muskegon County Jail since October 2012 for operating a meth lab. He is also a habitual offender with prior felony convictions for second-degree criminal sexual conduct in 2007; and assaulting, resisting or obstructing an officer in 2005.