A lockdown at the Springhill Institution has been lifted. The prison was placed in lockdown on Monday after a pair of correctional officers were assaulted. The incident had forced prisoners to remain in their cells all week and visitors were also barred from the institution. Correctional Service Canada says 19 inmates were involved in the incident. One inmate was treated in hospital before returning to the prison. The correctional officers who were assaulted suffered only minor injuries.