Two rockets struck near the US embassy in Baghdad on Sunday, hours after the ambassador was summoned over a US strike that killed top Iraqi and Iranian commanders.
Six Katyusha rockets fell in total on the Iraqi capital on Sunday evening, including three inside the city's heavily-fortified Green Zone housing government buildings and foreign missions. The US embassy is based there.
The three other rockets fell in the Jadriya area nearby, a military statement said on Sunday.
Police sources said six people were wounded in the attacks.
Sunday's attack was the second night in a row that the Green Zone was hit and the 14th time over the last two months that US installations have been targeted.
Ties between Iraq and the US have deteriorated after an American drone attack Friday on the Baghdad international airport that killed Iran's Maj Gen Qasem Soleimani and top Iraqi military figure Abu Mahdi al-Muhandis.
The strike came just days after a pro-Iran mob attacked the US embassy in Baghdad.
In response on Sunday, Iraq's parliament called on the government to oust US and other foreign troops from the country.
More than 5,000 US troops are stationed across Iraqi bases to support local soldiers preventing a resurgence of ISIS.
They are deployed as part of the broader international coalition, invited by the Iraqi government in 2014 to help fight the terror group.
Sunday's rocket attack came hours after a deadline by a hardline group in Iraq's Hashed Al Shaabi military force, which has close ties to Iran, for Iraqi security forces to "get away" from US troops at joint bases across Iraq.