Police have released a photograph of Kyle McDonald, one week after the 19-year-old was shot dead in a street in Battersea. Police are asking witnesses to contact them.
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Officers believe the three assaults are linked and are appealing for information about the suspect.
Nine addresses in Lewisham were searched and 13 arrests made early on Tuesday morning in a planned, intelligence-led operation.
The Purple Rain singer died in April 2016