Car bombs and attacks on cities across Iraq killed at least 20 people and wounded more than 200, officials said.
The wave of attacks in Baghdad, Kirkuk, Nassiriya, Tuz Khurmato and other towns, came days before Iraqis vote in provincial elections.
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The beleaguered Labour Party leader is clinging onto power in the face of as many as 150 MPs voting to remove him from the top job today.
Mr Osborne said he is "not the person to provide the unity my party needs".
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