(Euronews: 1345 PST, April 18, 2011) Nigeria's Goodluck Jonathan has been officially declared the winner of the country's election, and his first call as re-elected president was an appeal for calm after violence erupted amid opposition claims of vote-rigging.

The Red Cross said many people were killed in the north of the country when churches, mosques and houses were torched. Curfews have been imposed in Kaduna state and Kano. EU monitors say it was Nigeria's fairest election for decade.