The Regional District of Central Okanagan says the incidents took place in Mission Creek Regional Park, near Kelowna, B.C., early in the afternoon.
During the first incident, a visitor and an on-leash dog stumbled upon a mother bear, which stood up and became agitated.
A second hiker was also forced to backtrack from the bear in a separate encounter.
Officials say four bears, including a male, female and two cubs, have been roaming a section of the park.
They say Tuesday's incidents are the first reports of potentially serious conflicts between humans and bears.
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