Three Katyusha rockets fired on Tuesday at the heavily fortified Green Zone in central Baghdad, an Interior Ministry official said.

The incident took place in the night when unknown militants fired the rockets at the zone, which houses some of the main Iraqi government offices and the US embassy, the official told Xinhua on condition of anonymity.

Sirens were heard in the zone, as the rockets landed inside the zone, but there were no immediate reports about casualties, the official said.

The heavily fortified Green Zone has been frequently targeted by insurgents' mortar and rocket attacks. The roughly 10-square-km zone is located on the west bank of the Tigris River, which bisects the Iraqi capital.

Earlier in the day, the Iraqi military said that two rockets hit on Monday evening Bismayah Camp which houses international coalition forces southeast of the Iraqi capital Baghdad, without giving further details about casualties.

The Bismayah Camp is the second largest military base for training the Iraqi army after the al-Taji Camp.

The two attacks came after several rocket attacks targeted military bases housing international coalition forces, including the one on the camp Taji that killed two US soldiers and one British service member.

Over 5,000 US troops have been deployed in Iraq to support Iraqi forces in battles against the Daesh state, mainly for training and advisory purposes.

Source: Bernama