The underlying rate of Retail Prices Index (RPI) inflation fell to 3.7% in March, from 3.8% in February, the ONS said.
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The venue will open its doors again for the first time since May's bombing on September 9 for the We Are Manchester concert .
Reports peaked in June, when the London Bridge and Finsbury Park attacks took place, with the service receiving 5,703 calls.
Long-awaited A-level results will be received by teenagers on Thursday, the first to do so following major reforms of the system in England.