The Calgary police are investigating the attack on the stampede ground on Tuesday which is seriously injured.
Investigators say after 11 pm, the authorities responded to the attack report near Euroslide on Calgary Stamped Midway.
When the police reached the spot, they found a person in medical crisis. He was taken to the hospital in a fatal but stable position.
Some time later, the authorities were called for two more reports of individuals in medical crisis: 17 Avenue SE and a young and a person near Erlton Street SW and 27 Avenue SW in the field of McLeod Trail.
According to the police, the pair were taken to the hospital in a serious but stable position.
Investigators believe that all three attacks are connected and targeted.
The identity of the suspects has not been identified or arrested.
Police say many witnesses saw the incident, and some recorded it on cellphone.
Whoever saw the incident or at that time has a video footage from the area, is asked to contact the police on 403-266-1234 or anonymous tip through crimestoppers.
The investigation is in its early stages, and the police say more information will be shared if available.
