Israel's Prime Minister has begin spelling out his concerns over Iran in an address to the US Congress, in a move that has touched Democrat nerves.
Fierce clashes are taking place in and around the Iraqi city of Tikrit, as soldiers and militiamen attack Islamic State positions, officials say.
Iran rejects as "excessive and illogical" a demand by US President Obama that it freeze sensitive nuclear activity for at least 10 years.
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Iraq moves against IS in Tikrit
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