Israel and Iran exchange missile attacks for a third day; nuclear sites hit, death tolls rise, airspace shut, U.S. warns Tehran against retaliation.

Neither country is showing signs of backing down as the conflict between the regional foes raged for a third day.

By Alexander Cornwell, Parisa Hafezi and Jeff MasonTEL AVIV/DUBAI/WASHINGTON (Reuters) - Israel and Iran kept up their attacks, killing and wounding civilians and raising concern among world leaders at a G7 meeting in Canada this week that the biggest battle between the two old enemies could lead to a broader regional conflict.

Israel hit more targets in Tehran and Iranian missiles fired at Israel killed at least 14, as the conflict entered a third day

The UK government is trying to walk a tightrope on relations with Israel, expressing support for its military action against Iran while also criticizing the war in Gaza.

Israel and Iran have opened a new chapter in their long history of conflict. Israel launched a major attack with strikes early Friday that set off explosions in the Iranian capital of Tehran.

Israel's airstrikes on Iran's military and nuclear facilities led PM Netanyahu to hold urgent talks with world leaders, including PM Modi.