Leaders of some of the world’s biggest economic powers will arrive in the Canadian Rockies on Sunday for a Group of Seven summit overshadowed by a widening war across the Middle East and U.S. President Donald Trump’s unresolved trade war with allies and rivals alike.

World leaders may face smoke warnings when they gather next week in Alberta as wildfires burned out of control across much of Canada and caused the country's second-worst fire season in decades.

Responsibility for ensuring the safety and security of all G7 Summit participants, including foreign dignitaries and heads of state, lies with the Royal Canadian Mounted Police’s Integrated Safety and