BAGHDAD, (Reuters) - Islamic State took over Iraq's biggest dam unopposed by Kurdish fighters, who also lost three towns and an oilfield on Sunday to the Sunni militant group, witnesses said, sharply raising the stakes in its bid to topple the Baghdad government.
Control of the dam could give Islamic State, which has threatened to march on Baghdad, the ability to flood major cities.
(Writing by Michael Georgy; editing by Jane Baird)
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