It remained to be seen whether the attack would ignite a regional war or provide the U.S. and Iran with an off-ramp from their intensifying confrontation.

Iran announced Monday night that it had launched an attack on American forces at Al Udeid Air Base in Qatar, calling it a “mighty and successful response" to U.S. aggression.

The ceasefire announcement comes on the heels of a retaliatory strike from Iran on a U.S. airbase in Qatar on Monday.