The number of assaults against staff who work in federal prisons in Ontario jumped by roughly 20% in the past three years, according to an internal Corrections Canada report (read it in full after the jump). There were 76 assaults on staff in the province last year, compared to 63 in 2007, according to the document obtained by Cancrime. Most of the attacks happened at three facilities: Kingston Penitentiary, Millhaven Institution, and at the Regional Treatment Centre, a separate facility inside the stone walls of Kingston Pen. All of those facilities are in the Kingston area. Nearly half the assaults on staff in Ontario last year happened at Kingston Penitentiary, Canada’s oldest federal penitentiary – it opened in 1835.