Former U.S. President Donald Trump brokered a ceasefire between Israel and Iran on Monday following a rapid series of backchannel negotiations involving Israeli Prime Minister Benjamin Netanyahu and senior Iranian officials, according to a senior White House official.

The official, speaking on condition of anonymity due to the sensitive nature of the talks, said the breakthrough came after Trump personally spoke with Netanyahu, while Vice President JD Vance and members of Trump’s national security team engaged in direct communication with Tehran.

The ceasefire, which took effect early Tuesday, ended 12 days of intensifying conflict that saw Iranian missile attacks on Israeli-held territories and retaliatory threats from Israel and its allies.

“Israel agreed to halt its military operations provided that Iran refrains from launching any new attacks,” the U.S. official confirmed. “Tehran signaled its intent to stand down, which was key to finalizing the agreement.”

While Trump publicly announced the ceasefire, the behind the scenes diplomacy only became clear Tuesday morning as both sides began to implement the truce.

Iranian state media confirmed the deal came into effect following a final wave of missile strikes that killed at least seven people in southern Israel. No new attacks have been reported since the agreement took effect.

The Israeli military has since lifted public shelter orders nationwide, a move signaling confidence that the ceasefire will hold at least for now.

Experts have noted the deal’s unusual structure, with Iran initiating the stand down and Israel agreeing to follow 12 hours later. While the ceasefire has brought immediate calm, regional analysts caution that its durability will depend on whether hardline factions in either country choose to escalate.