At least five katyusha rockets landed in the heavily fortified Green Zone in Iraq’s capital, some of which directly struck the U.S. embassy, caretaker Prime Minister Adil Abdul-Mahdi said early Monday.

“This hostile attack on a foreign mission was repeated with missiles falling inside the U.S. embassy compound. While condemning this illegal act, we instructed our security forces to arrest the attackers and bring them to justice,” Abdul-Mahdi said in a statement

No casualties or material damage has been reported so far.

He added that this kind of attack could turn Iraq into a conflict zone.

Read more: US embassy in Baghdad hit by missiles