Violence elsewhere in the country, meanwhile, left five people dead, bringing to nearly 700 the number of people killed in nationwide unrest this month, fuelling fears Iraq is slipping back into the all-out conflict that left tens of thousands dead in 2006 and 2007.
Diplomats have urged Baghdad to foster political reconciliation to undercut support for militants, but with elections looming in April, Iraqi Prime Minister Nuri al-Maliki and others have taken a hard line and focussed on wide-ranging security operations.
Iraqi security personnel, including soldiers, policemen and SWAT forces working with pro-government tribal fighters continued to assault key neighbourhoods of Ramadi today in a bid to wrest back control from gunmen who have held the areas for more than three weeks.
They suffered casualties, however, with a dozen security personnel and armed tribesmen wounded by snipers during clashes in the central Ramadi neighbourhoods of Malaab and Dhubat, a police major and Doctor Mohammed Fanoos from the city's hospital said.
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Both Ramadi and Fallujah lie in Anbar province, a mostly-Sunni desert province west of Baghdad along the border with Syria.
The United Nations warned today of "an exponential increase in the number of displaced and stranded families," with more than 22,000 families having registered as internally displaced.
The UN said the actual figure was likely to be higher, as not all those who fled had registered. It said of those who had left, most had found refuge elsewhere in Anbar, but some had gone as far afield as the northern Kurdish region.
UN chief Ban Ki-moon and other diplomats have called for the Shiite-led authorities to address long-standing grievances in the disaffected Sunni minority, and officials have made some concessions.