Police have made a fourth arrest in relation to the stabbing of 17-year-old Promise Nkenda.
A 14-year-old boy was arrested on March 1 and charged with murder.
He will appear in custody at Stratford Youth Court today.
On Saturday, two boys aged 17 were arrested and charged with Promise’s murder and robbery. A third boy was arrested on Monday and taken to an East London police station, but has been bailed until mid-march.
Promise, from North Woolwich, was stabbed in the chest in Canning Town on February 14. He died at the scene.
The 17-year-old was the third teenager in London killed as a result of knife crime so far this year.
On Sunday, family and friends released balloons in Pier Road in tribute to the teenager.
Anyone with information should contact the Homicide and Major Crime Command incident room on 020 8345 3775 or via 101 quoting reference 8884/14Feb.
Alternatively, they can call Crimestoppers anonymously on 0800 555 111.
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