The Prime Minister was in Enfield this morning for the opening of a warehouse which was destroyed during the riots last year. The site which is used by Sony has been closed for a year while it was rebuilt.
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Figures show there were 15,546 knife crime offences in London in 2019 compared to 14,680 the previous year.
In one location, Churchill Park in Islington, north London, eight knives were found hidden during three weapons sweeps.
The number of new cases has risen sharply in China, the centre of the outbreak.