Israel and Iran have traded more missile attacks despite international calls for a halt to the fighting, with neither country showing signs of backing down as the conflict between the regional foes raged for a third day.

Smoke and flames filled the sky over Tehran as Israel struck oil and gas facilities in the Iranian capital and targeted more nuclear facilities during attacks that carried on into Sunday after starting two days earlier.

Israel faced retaliation from Iran after launching missiles against Tehran's leadership and energy infrastructure as part of "Operation Rising Lion" this weekend. Iran's military responded with a wave of missile strikes against Israel,

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

The exchange of fire comes as talks on Iran's nuclear program in Oman between the U.S. and Iran were called off.

A sixth round of nuclear talks between the United States and Iran, previously scheduled for Sunday, was canceled amid escalating tensions between Israel and Iran.

There will be no nuclear talks with Iran on Sunday, a senior U.S. administration official says, adding Washington still hopes Tehran will resume negotiations soon. “We remain committed to talks and hope the Iranians will come to the table soon,

Three people have been killed in Israel, according to officials and local media, with both sides saying the strikes will continue.