TEHRAN, June 9 — Iran and Israel said yesterday that hostilities between them had halted, after the two countries exchanged strikes that threatened to reignite the Middle East...

Monday’s strikes by both Iran and Israel are the most serious escalation in the conflict since the ceasefire between the U.S.-Israel side and Iran went into effect in April.

Two regional officials said concerted diplomatic efforts were underway Monday to salvage the ceasefire.