In November of last year, the earlier incident injured 11 people, two of them critically. The bear responsible was never found.
Tyre said that attack, in 2025, was on a school group, also in the Bella Coola area. DNA testing confirmed the four bears killed after the latest deaths were not involved, he said.
The deaths have hit a community still recovering from a separate attack last year. Residents described the latest attack as deeply re-triggering as that recovery continues.
Investigators said the animals were a sow and its three offspring. Evidence from the inquiry, together with animal DNA, was analysed and conclusively tied the attack to those four bears.
More than a dozen conservation officers took part in the investigation of the mother and daughter's deaths over the past week, he added.
They worked, he said, in difficult terrain and weather.