Cardiff announced Malky Mackay's job was safe a week ago after fans voiced their anger at the report that he had been told to resign or be sacked by the Welsh club's owner Vincent Tan.
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Police carried out a "proactive" operation after receiving reports that other concerts by the band had seen lots of mobile phone thefts.
The child died on her injuries and another 14-year-old girl was injured after the buggy they were travelling in was involved in a car crash.
Cloud thickening from the west throughout the day. Rain in northwest later.