Gunmen fired on Egyptian wedding-goers outside a Coptic Christian church in a Cairo suburb the evening, killing two people and wounding seven, security sources said.
The men were on a motorcycle and shot at the people as they left the church, the sources said.
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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."