Two of the attackers named by a Kenyan military spokesman are known members of al-Hijra, a Kenyan extremist group affiliated with al-Shabaab, according to the former head of the United Nations Monitoring Group on Somalia.
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Witnesses reported hearing a "huge bang" at the venue during the concert on Monday evening.
ITV News travels to Britain's eastern-most city to gauge how the electorate will be casting its votes.
Carefully choreographed campaigns can become unstuck because voters have the power to peel back a politician's veneer.