AFP, Baghdad :Iraqi forces entered the ISIS group bastion of Fallujah from three directions on Monday in a new phase of the operation to recapture the city, commanders said.”Iraqi forces entered Fallujah under air cover from the international coalition, the Iraqi air force and army aviation and supported by artillery and tanks,” said Lieutenant General Abdelwahab al-Saadi, the commander in charge of the operation.”Counter-terrorism service (CTS) forces, the Anbar police and the Iraqi army, at around 4 am (0100 GMT), started moving into Fallujah from three directions,” he said.”There is resistance from Daesh,” he added, using an Arabic acronym for ISIS.CTS spokesman Sabah al-Norman told AFP: “We started early this morning our operations to break into Fallujah.”The involvement of the elite CTS marks the start of a phase of urban combat in a city where US forces in 2004 fought some of their toughest battles since the Vietnam War.The week-old operation had previously focused on retaking villages and rural areas around Fallujah, which lies just 50 kilometres (30 miles) west of Baghdad.Only a few hundred families managed to slip out of the Fallujah area ahead of the assault on the city, with an estimated 50,000 civilians still trapped inside, sparking fears the jihadists could try to use them as human shields.Fallujah is one of just two major urban centres in Iraq still held by ISIS. They also hold second city Mosul.”Iraqi forces entered Fallujah under air cover from the international coalition, the Iraqi air force and army aviation, and supported by artillery and tanks,” said Lieutenant General Abdelwahab al-Saadi, the commander of the operation.”CTS forces, the Anbar police and the Iraqi army, at around 4:00 am (0100 GMT), started moving into Fallujah from three directions,” he said.”There is resistance from Daesh,” he added, using an Arabic acronym for ISIL.CTS spokesman Sabah al-Noman said: “We started early this morning our operations to break into Fallujah.”Fighting on Monday followed battles a day earlier, adding to the exodus of thousands of desperate civilians from the surrounding areas and deep concern for the many more trapped in the battlegrounds.Also on Monday, at least nine people were killed and 26 were wounded in bombings north and northeast of the capital Baghdad. The week-old operation to liberate Fallujah has so far focused on retaking villages and rural areas close to the central city, which lies just 50 kilometres west of Baghdad.CTS’s involvement will mark the start of a phase of urban combat in a city where US forces in 2004 fought some of their toughest battles since the Vietnam War.