Two men will appear in court today charged with the murder of Mohammed Hussein in Edmonton on Monday night.
The 19 year old died of a single shotgun wound to his chest.
Natneal Tefsay and Christopher Aluma will appear in custody at Highbury Corner Magistrates' Court later today
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Firearms officer Martin Finney was awarded the George Medal, Britain's second highest civilian decoration.
Members of the RMT union who work on the Central Line will walk out at 9pm on Wednesday.
Southeastern was hit after a freight train derailed causing travel chaos for hundreds of thousands of passengers.