A government official said two were confirmed dead after being fatally injured in the van incident in Toronto on Monday (local time).
Efforts are underway to confirm the exact condition of the injured Korean, he added. The three victims' identities have not been disclosed.
The government has dispatched consular staff to local hospitals and police stations to make sure there are no more victims from the incident, the official said.
Three others Koreans have not been accounted for since the incident took place.
"The foreign ministry has taken necessary steps, including contacting the families of the victims, and plans to provide relevant consular support in case the families want to visit there," the official said.
Canadian media reported that a white van plowed down a Toronto sidewalk crowded with pedestrians, killing 10 people and injuring 15. Local authorities are investigating whether it was a terrorist attack.
The area is where a Korean community is located. Observers say that the number of casualties appears to be high since the incident happened when many people rushed out for lunch. By the yonhap.