The maximum security penitentiary north of Edmonton is under lockdown for the second time in a week, after a bloody morning.

Officials told CTV News an inmate suffered non-life threatening injuries after he was stabbed Saturday.

The Edmonton Institution has been placed under lockdown until further notice.

It's the second time an inmate has been stabbed in only a few days.

Police said 21-year-old Mason Tex Montgrand was killed after an altercation and stabbing Tuesday night.

Charges are pending in that case against another inmate.