Abdulahi Hasan Sharif, a 30-year-old refugee from Somalia, arrived at a border checkpoint in 2012 and "requested asylum from Canada," Immigration Minister Ahmed Hussen said.
"He went through the regular process at that time and he was granted refugee status later that year," he said.
US Immigration and Customs Enforcement (ICE) revealed Sharif had been detained for four months in San Diego, California in 2011 and ordered removed to Somalia by an immigration judge.
Two months later on January 24, 2012, however, he failed to report to authorities for removal and efforts to locate him were not successful, Mack said.
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Prime Minister Justin Trudeau, responding to questions about why Sharif was granted asylum when he likely should have been turned away under Canadian law, said: "We are looking into exactly what happened in this situation, but it's certain that we have asylum processes that needed to be followed rule by rule."
Sharif appeared yesterday in an Edmonton court where he was charged with five counts of attempted murder and related offenses.
Subsequent proceedings have been delayed until the defendant obtains a lawyer.
Late Saturday, the suspect drove his car into a barrier outside an Edmonton football stadium and struck a policeman directing traffic. He then jumped out and tried to stab the officer, who fought him off with one hand.
Hours later, the suspect took police on a wild chase through the city's downtown in a rented van as he tried to mow down pedestrians, before the vehicle was knocked over and the driver was apprehended.