NAIROBI, May 15 (Reuters) - Two foreign aid workers kidnapped by gunmen last week in northern Somalia's semi-autonomous Puntland region have been freed by their captors, an aid agency source said on Tuesday.

The two men -- a Briton and a Kenyan -- were understood to have been handed over to local elders on Tuesday after negotiations and were in good health, the source said. They work for CARE International and were abducted last Wednesday.

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