Canada’s security operation for G7 summit faces unorthodox threat … bears

A grizzly bear crosses Highway 11 near Timber Creek, Alberta. Six dozen grizzlies are known to live in the region where the G7 summit is being held. Photograph: All Canada Photos/Alamy

Security preparations for G7 summits normally involve the elite close protection afforded to world leaders, and then a series of of concentric defences against street demonstrations and protests.

Not in the Rockies.