HOBBS. N.M. (AP) — A medium-security prison in New Mexico remains under lockdown following a disturbance involving several inmates in multiple housing units.

Officials at the Lea County Correctional Facility near Hobbs say Wednesday night's disturbance was brought under control within an hour and no injuries were reported.

The New Mexico Corrections Department has started an internal investigation into the incident that began around 9:30 p.m. Wednesday when several inmates in four housing units refused to follow orders to go back to their cells.

Correctional officers used tear gas to force the inmates into their cells and secured the housing units.

Prison officials say the lockdown will continue until further notice.

The Lea County Correctional Facility houses 1,250 inmates and is privately operated under a contract with the state.