( CNN ) -- An ex-employee allegedly stabbed four former co-workers at a Toronto office building Wednesday , authorities said . At least one employee of Ceridian , a payroll services company , was critically wounded , a police spokeswoman said . `` Out of respect for the privacy of the individual and their family , we are not able to share or comment on the specifics of the individual 's condition , but all four employees are being treated by medical experts at area hospitals , '' a Ceridian statement said . A suspect was taken into custody , according to Toronto Police Constable Jennifer Sidhu , who said the attacker used either scissors or a knife . The suspect was identified by police as Chuang Li , 47 . He faces charges of attempted murder , aggravated assault and assault with a weapon . The attack happened on the office building 's fifth floor , Sidhu said . One of the four people hospitalized had life-threatening wounds , she said . Two others suffered non-life-threatening injuries and a third was treated and released , police said . Police did not immediately reveal a possible motive in the attack or details about any relationship between the suspect and the victims . `` As you might imagine , this is a very difficult time , '' the company statement said . `` The entire Ceridian family is shocked and deeply saddened by this incident . '' Mass stabbing at Pennsylvania school . CNN 's Chris Boyette contributed to this report .
NEW : Police identify suspect as 47-year-old Chuang Li . `` This is a very difficult time , '' the company says . The attack happened on the office building 's fifth floor . One of the four people hospitalized suffered life-threatening wounds .