In March the family of Lance Corporal Foley paid the following tribute:
"Michael passed away while on operational duty in Afghanistan where he was very proud to be serving his country in support of our combined forces in this theatre of operations.
"He will be sorely missed by his family and friends and everyone privileged to serve with him both on his last tour and during his military career."
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."