The BBC's James Landale highlights the role of the US president at the summit as the conflict in the Middle East overshadows the gathering.

Donald Trump said late on Monday his early departure from the Group of Seven nations summit has "nothing to do with" working on a ceasefire between Israel and Iran, denying comments by French President Emmanuel Macron who said the U.

Donald Trump has left the G7 summit in Canada early to return to Washington as the conflict between Israel and Iran intensified.

Blasts have been heard in Tehran and sirens have sounded in Israel as US president convenes National Security Council.

Whether the U.S. gets more involved than it already is, some members of Congress from both parties argue, should not be up to the President.

U.S. President Donald Trump participated in a meeting of the G7 in Canada on Monday that had a wide range of pressing issues including the Israel-Iran conflict and trade He and counterparts from Europe and Japan,

Traffic jams line the roads out of Tehran as Iranians flee the city, while Iran and Israel have been exchanging more missiles.