Twitter user @Rajigolo shared this picture of a smashed window at the Piebury Corner shop near Arsenal's Emirates Stadium.
Piebury Corner's website shows the shop's facade before the damage:
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Detectives have charged 19-year-old Bilal Mumin with murder, grievous bodily harm and possession of an offensive weapon.
Members of the RMT on Arriva Rail North (Northern) walked out for 24 hours, with more stoppages due on Thursday and Saturday.
Police said a dozen shots were fired, but no arrests have been made and they are looking for a dark vehicle.