Reigning US Open champion Andy Murray crashed out of this year's tournament in the quarter-finals after suffering a defeat in straight sets to Switzerland's Stanislas Wawrinka.
The ninth seed beat Britain's number one 6-4 6-3 6-2.
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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.