Iraq's army has launched an operation to retake parts of Ramadi, a city largely controlled by ISIS.

On Saturday the army focused on eastern suburbs of Ramadi, the capital of Anbar province, located 130km (80 miles) west of the capital Baghdad.

Iraqi officials say that during the operation, soldiers found the bodies of Sunni tribesmen killed by ISIS for opposing the group. ISIS militants - also Sunnis - have seized large areas of Iraq and Syria.

The jihadists control almost all parts of Anbar, despite operations by the Iraqi army backed by US air strikes. Some local Sunni tribes have also joined the fight against ISIS.

Earlier this month tribal elders said hundreds of members of the Al-Bu Nimr tribe - mostly from the town of Hit - had recently been killed by ISIS.

The latest killings reported in the Ramadi area targeted the Al-Bu Fahd tribe. An official told Reuters news agency that the bodies of 25 tribesmen had been found in areas recaptured by the army.