Authorities in North Carolina say two supervisors were stabbed and two correctional officers sustained other injuries after being attacked at a state prison.

The North Carolina Department of Public Safety says a lieutenant and a sergeant were stabbed by inmates at Lanesboro Correctional Institution in Polkton around 2 p.m. Thursday. Department spokesman Keith Acree said the two are being treated for their injuries at local hospitals.

Acree said two correctional officers were injured after being assaulted with a broom handle. They were treated by prison medical staff.

According to Acree, the prison is temporarily locked down while an investigation begins. He said three inmates believed to be involved in the assault have been identified and are being questioned.

Polkton is 45 miles southeast of Charlotte.