A Brown County Jail inmate assaulted and injured a jailer Wednesday, and the same inmate injured a second jailer Thursday, Sheriff Bobby Grubbs said.

Grubbs said the inmate, who he did not identify, knocked a jailer down Wednesday, cracking the jailer's shoulder.

On Thursday, Grubbs said, the inmate head-butted another jailer, sending him to the emergency room.

Before Wednesday's assault, the inmate had previously been involved with altercations with two other jailers, Grubbs said.

Grubbs, speaking by phone around 6:30 p.m., said he would likely release more details Friday morning.