Tehran said American bases in the Middle East could face reprisals if the U.S. helped repel Iranian attacks on Israel.

KANANASKIS, Alberta — Leaders of some of the world’s biggest economic powers arrive in the Canadian Rockies on Sunday for a Group of Seven summit, overshadowed by an escalating conflict between Israel and Iran and U.S. President Donald Trump’s unresolved trade war with allies and rivals alike.

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The risk of conflict is growing as Iran signals strikes on Israeli nuclear facilities despite ongoing nuclear talks.

The Lebanese militant group Hezbollah was long considered Iran’s first line of defense in case of a war with Israel