Kenyan gunmen killed at least 12 people in a revenge attack following a massacre last month in which 52 people were killed in the remote southeastern Tana region, Red Cross officials said Friday.

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A new outbreak of post-poll rioting in Northern Nigeria left many dead overnight, the Red Cross said on Tuesday, after President Goodluck Jonathan appealed for unity following his win.

Sri Lanka's government has ordered the International Committee of the Red Cross (ICRC) to close its offices in the island's former war zone, the Geneva-based humanitarian agency said on Sunday.