At least two mortar shells landed inside Baghdad’s heavily-fortified Green Zone on Tuesday as insurgents continued their recent wave of attacks on the Iraqi city.

Security officials told the Associated Press no casualties were reported inside the Green Zone, which houses the Iraqi government headquarters and the U.S. and British embassies.

The officials said one of the mortar shells fell about 500 meters from the U.S. embassy building

The incident came amid a wave of bombing attacks in and near Baghdad that killed at least 30 people. Police officials said the deadliest attack took place Tuesday afternoon when a double car bomb attack hit Habaybina restaurant in the Shiite-majority district of Talibiya in eastern Baghdad, killing 19 people and wounding 32 others.

Earlier, a bomb struck at an outdoor market in the southern district of Abu Dashir, a mostly Shiite neighborhood, killing four people and wounding nine, police officials said.

Later, a bomb that went off near a small restaurant in central Baghdad killed five people and wounded 12, the officials said. Another bomb exploded at a commercial street in the town of Madian, just south of Baghdad, killing two people and wounding four.

No one immediately claimed responsibility for the latest attacks but they bore the hallmarks of the Islamic State, which has captured large chunks of territory in western and northern Iraq, plunging the country into its worst crisis since U.S. troops left at the end of 2011.

The Associated Press contributed to this report.