Nigerians are waiting in hope and fear for results of the tightest and most bitterly contested presidential election in the nation's turbulent history. Collation of results starts Monday at noon local time (1100 GMT) and the winner could be named later Monday or Tuesday, electoral officials said.
Nigeria Election - March 30, 2015

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As Nigerians await results in the tightest and most bitterly contested presidential election in the nation's history, a Nigerian election official reads local results in Kaduna, March 30, 2015.

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Women from communities in Rivers state protest against irregularities in voting in the weekend's election, at Port Harcourt, Nigeria, March 30, 2015.

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Security forces face up to protesters against the recent election in Port Harcourt, Nigeria, March 29, 2015.

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People read newspapers with election headlines on the street in Abuja, Nigeria, March 30, 2015.