Dozens of defense and foreign ministers will meet in Washington on Wednesday and Thursday to take stock of the fight against Islamic State, their focus increasingly on a major prize: the militant group's bastion in Mosul, Iraq.

The battle for Mosul is expected to be difficult, but the aftermath could be tougher, Iraqi, United Nations and U.S. officials say. So far, there are no plans, personnel or money to restore basic services and security for residents and as many as 2.4 million displaced people.

Defense ministers of the anti-Islamic State coalition will meet at Joint Base Andrews outside Washington on Wednesday, followed by a joint session of foreign and defense chiefs on Thursday.