Five weeks after a military operation began, a senior Iraqi commander declared Sunday that the city of Fallujah was "fully liberated" from the Islamic State group, giving a major boost to the country's security and political leadership in its fight against the extremists.Recapturing Fallujah, the first city to fall to the Islamic State group more than two years ago, means that authorities can now set their sights on militant-held Mosul, Iraq's second-largest city.Prime Minister Haider al-Abadi, visiting central Fallujah with the celebrating troops, vowed that the Iraqi flag would next be raised above Mosul. But that campaign has been progressing in fits and starts, revealing the deep divisions among the different groups that make up the security forces.

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