Yukon Health Minister Tracy-Anne McPhee declared a substance use emergency Thursday morning in the wake of at least four drug-related deaths in a single week, according to CBC Canada.

Four people in the Yukon died due to illicit drugs in the first week of the new year, said Chief Coroner Heather Jones in a news release Wednesday. Three of the deaths involved fentanyl.

Three more deaths suspected to be drug related are being investigated by the Yukon Coroner's Service.

Jones said the territory is seeing people from their early 20s to their 70s affected by the crisis.