An array of Iran-backed Iraqi militia groups have agreed to suspend rocket attacks on U.S. forces on condition that Iraq's government presents a timetable for a withdrawal of American troops, one of the groups said on Sunday. "The factions have presented a conditional ceasefire," said Mohammed Mohi, spokesman for the Iran-backed Kataib Hezbollah group. "It includes all factions of the (anti-U.S.) resistance, including those who have been targeting U.S. forces," he told Reuters.