Iraqi militia groups fired two Katyusha rockets on a house in Baghdad, killing two women and three children and wounding two other children, the Iraqi military said Monday.

The rocket targeted the Baghdad international airport but struck a residential home close by, two security officials said. They requested anonymity in line with regulations.

The attacks have become a frequent occurrence, often targeting the U.S. Embassy in Baghdad, within the heavily fortified Green Zone, and U.S. troops present in Iraqi bases as well as the Baghdad airport. Roadside bombs have also frequently targeted convoys carrying equipment destined for U.S.-led coalition forces.

Monday's violence was the first time in months the attacks caused civilian casualties.

The frequency of the rockets has strained Iraq-U.S. relations, prompting the Trump administration last week to threaten to close its diplomatic mission in Baghdad if Shiite militia groups believed to be orchestrating them are not reigned in.