At least 26 people have been killed in Kenyan coastal town attack, according to government officials cited by AFP.
Unidentified gunmen attacked a coastal town in Lamu county and set fire to at least three hotels and a petrol station on Sunday evening, police and the Kenya Red Cross said.
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The victims were collecting permits and escorts a day after their home town was liberated from the extremists.
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.