One of seven people arrested in a Metropolitan Police counter-terrorism operation has been released without charge.
The 30-year-old woman had been arrested in west London on Thursday.
Six other people are still being held in custody.
Police say the operation is not linked to the Olympics or Paralympics.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants