An inmate at the Jessup Correctional Institution in Anne Arundel County was admitted to Maryland Shock Trauma Center after another inmate stabbed him yesterday evening, said a spokeswoman for the state Department of Public Safety and Correctional Services.

Shortly before 6 p.m., several inmates were standing in a line in a common area when an altercation broke out between the victim and at least one other inmate, said Danielle Wilmsen, the spokeswoman.

She said the victim, a 55-year- old man serving a life term since 1983 for first-degree murder, was stabbed in the upper body with an unknown weapon and was treated at the scene by medical staff before being taken to Shock Trauma by ambulance.

Wilmsen said a power outage at the facility near the time of the attack was not connected to the incident.

She said the stabbing is being probed by the department's internal investigation unit and that no arrest had been made.