Police in Iraq have said 47 people have been killed by a suicide bomber at a political rally in a northeastern city last Friday.
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The well-respected foreign policy hawk enjoyed his greatest successes as national security adviser to President Jimmy Carter.
Police have arrested two men aged 20 and 22 on suspicion of terror offences, bringing the number of people are now in custody to 11.
Among those attending the Soundgarden and Audioslave singer's funeral were Brad Pitt, Pharrell and Christian Bale.