The conflict, the most intense fighting between the two countries in decades, has been met in the United States with feelings of “frustration and helplessness,” as well as heartbreak.

Iran-aligned Iraqi armed group Kataib Hezbollah warned on Sunday it would resume attacks on U.S. troops in the region if the United States intervenes in the conflict between Israel and Iran.

The deadly conflict between Israel and Iran has entered a fourth day, with both sides firing waves of missiles overnight. Follow for live updates.

Israel decimated the group’s leadership last fall and degraded its military capabilities. Can the same strategy work against a far more powerful foe?

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.

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

Iran has launched a new wave of missile attacks on Israel, triggering air raid sirens across the country as emergency services reported projectiles striking and shrapnel falling in Israel’s north and center,