At least 50 of the more than 300 children snatched by gunmen from a Catholic school in Nigeria have escaped their captors, a Christian group said on Sunday, as the president announced the rescue of 38 worshippers seized in a separate attack last week.

Gunmen on Friday raided St Mary's co-education school in Niger state, taking 303 children and 12 teachers in one of the largest mass kidnappings in Nigeria. 

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