Rockets hit Baghdad’s Green Zone where the US Embassy is located Wednesday night. It was the latest in a string of such attacks by unknown groups as the United States and Iraq discuss the status of the American military in the country.

Iraq’s Security Media Cell, a part of the prime minister’s office that reports on security developments, reported that four rockets fell in the fortified Green Zone, where several embassies are located, late Wednesday night. The incident was “without human or material losses,” the cell said in a tweet. Security forces determined the rockets were fired from south Baghdad.

The attack followed several other recent rocket attacks in the Green Zone and on US and Iraqi military positions in the country. On Monday, rockets hit Baghdad International Airport, where both US and Iraqi forces are. On Sunday, Iraqi forces thwarted a rocket attack on their positions and near a base hosting US troops north of Baghdad. A rocket also landed near the Baghdad airport last week.

In a more deadly incident, two American troops and one British soldier died during a rocket attack at Camp Taji in March. The Iraqi military base hosts foreign troops who are part of the global coalition fighting the Islamic State (IS).