The Met Police has told cyclists involved in the 'critical mass' procession to keep moving and keep south of the Thames.
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Rose Leslie and Kit Harington are to marry at Rayne Church in Aberdeenshire.
The star founded his most well-known band with his brother, Dimebag Darrell, in 1981.
Emmerson Mnangagwa was not hurt in the explosion and was evacuated, however, witnesses reported several others were injured.