A BBC correspondent in the region, Ali Hashem, reports that "one Katyusha rocket was launched towards the US embassy in the Green Zone in Baghdad, no reports of casualties".
Reuters has confirmed an emergency security incident unfolding:
Two Baghdad-based diplomatic sources also said they heard the blast close to the Iraqi capital's fortified Green Zone which houses government buildings and foreign embassies.
The U.S. embassy in Baghdad and its consulate in the northern city of Erbil evacuated non-essential staff this week.
The Iraqi government has confirmed a rocket was fired toward the embassy, with no further attacks reported and no casualties, per Reuters:
A Katyusha rocket reportedly fell in central Baghdad's Green Zone on Sunday night, Iraq military personnel announced.