A melee on Wednesday afternoon a referral centre for the homless left a staffer at the office with what paramedics describe as 'critical injuries.'
Calls for help came in from the City of Toronto assessment centre, which is located near Peter and Richmond Streets, around 2:30pm.
A woman believed to be in her 30's was taken to a trauma centre after she was allegedly attacked.
A male suspect is under arrest.
It isn't clear yet whether the suspect is a co-worker, or was at the referral centre to get help.