An inmate at a Toronto detention centre is suffering from life-threatening injuries after three other inmates attacked him last week.

Toronto police said the 35-year-old male inmate at the Toronto South Detention Centre was assaulted by three male inmates on June 22.

Police have arrested Calvin Michail Nimoh, 23 of Mississauga; Mahad Liban Dahir, 23, of Toronto, and Tyler Almeida, 22, of Caledon.

The three are all facing charges of attempted murder, conspiracy to commit an indictable offence, aggravated assault, and criminal negligence cause bodily harm.

They were scheduled to appear in court at 2201 Finch Ave. W. Tuesday morning.