Police have made another appeal for witnesses to come forward after a teenager was shot dead on a residential street in Battersea.
Police believe "a number of young people" may have information about the course of events that led to the death of 19-year-old Kyle McDonald.
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Police in Harrow have released CCTV footage as part of a reappeal for information about a sexual assault that happened last November.
Members of the RMT union on the Northern Line are planning to walk out on Monday after a driver was sacked for failing a breath test.
The A&E department at Northwick Park Hospital in north London has been under pressure following the closure of two other A&E units.