The Winnipeg Police Service is investigating a serious assault at Seven Oaks Hospital that left a staff member in unstable condition.

Police say the attack happened around 2:30 p.m. on Wednesday but did not provide more information.

The Winnipeg Regional Health Authority says staff at the facility are devastated and additional security has been brought in.

“Our staff and leadership are devastated by this incident and our hearts and healing thoughts are with the victim and their family, as well as with all employees and patients at Seven Oaks,” a WRHA spokesperson says in a statement.

The hospital remains open but visitation was suspended for at least 24 hours, with the exception of end-of-life situations.

The WPS says the investigation is still unfolding and more details may be provided on Thursday.