The defense minister said people were killed and injured at the base in Alberta, but officials did not offer details on the cause.

© Jennifer Gauthier/Reuters

Prime Minister Mark Carney was among the speakers calling for a united Canada and warning about the dangers of division.

© Ian Austen/The New York Times

The new pipeline from Alberta’s oil sands to the Pacific Coast may lower separatist tensions in that province while also loosening energy ties with the U.S.

© Todd Korol/Reuters