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			 The election pits President Goodluck Jonathan against former 
			military ruler Muhammadu Buhari for the votes of an electorate 
			divided along ethnic, regional and religious lines in Africa's most 
			populous nation. 
			 
			The stock market was down 17 percent by 12.15 (1115 GMT), Thomson 
			Reuters data showed. The naira was pegged at around 199 to the 
			dollar by the central bank last month after it shut down the 
			interbank market. 
			 
			Even before preliminary tallies were recorded, the opposition All 
			Progressives Congress (APC) rejected the outcome in Rivers state, 
			headquarters of Africa's biggest oil industry, and denounced the 
			vote there as "a sham and a charade". 
			 
			The INEC election commission said first results from 120,000 polling 
			stations nationwide should be available on Sunday evening but later 
			pushed this back to Monday evening. 
			 
			Some observers cautiously praised the conduct of the election. 
			 
			The U.S. government's National Democratic Institute (NDI), which 
			promotes democracy and open government, praised the election, 
			despite the technical problems and sporadic violence. 
			  
			  
			 
			"Nigerian voters conducted themselves in a peaceful and orderly 
			manner on election day," it said. NDI official Christopher Fomunyoh 
			said in a news conference on Monday that the group saw no evidence 
			of the military interfering in the poll, as many had feared. 
			 
			Turnout among the 56.7 million registered voters appears to have 
			been high. 
			 
			All eyes are now on collation, historically an area where figures 
			were fiddled, with results sometimes completely made up. 
			 
			COLLATION PROCESS 
			 
			"We have concerns about the collation process because of the multi 
			layered collation mechanism," Fomunyoh said, referring to the fact 
			that results are collated separately in each polling station and 
			state as well as in the main center in Abuja, a practice he said 
			should be reviewed given the new technology. 
			 
			Results are expected to start streaming in this afternoon.World 
			powers and international investors are watching how Africa's biggest 
			economy and top oil producer, conducts this poll and whether it can 
			improve on its patchy record. 
			 
			Fitch revised Nigeria's credit outlook to negative on Monday, while 
			affirming its BB- rating. 
			 
			On Sunday, hundreds of sympathizers chanted "APC" outside the 
			electoral commission office in the oil city of Port Harcourt, 
			prompting police to fire warnings shots. One group stoned a car they 
			thought carried ballots. 
			 
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			"There was no election in Rivers," APC polling agent Achinike 
			William-Wobodo said, calling for a re-vote. Protests continued on 
			Monday, and police used tear gas to disperse a protest by at least 
			100 female APC protesters, a Reuters reporter saw. 
			 
			"We were protesting ... going to INEC (the electoral commission) and 
			they tear gassed the women," said protester Eva Ibiba. 
			 
			A policeman at the scene said: "They were disturbing the peace ... 
			their intention was to destroy INEC materials." 
			 
			In a sign the opposition will challenge results elsewhere, the APC 
			governor of the southern Imo state, Rochas Okorocha, denounced the 
			conduct of the election in his region and accused the military of 
			meddling in the result. 
			 
			In Bauchi state in the volatile Middle Belt, where Nigeria's largely 
			Christian south and mostly Muslim north meet, hundreds of youths 
			gathered outside the INEC office shouting APC slogans and shouting 
			that they would protect their vote from rigging, a Reuters reporter 
			saw. The military fired warning shots. 
			 
			The tensions the prospect of a disputed national outcome and a 
			repeat of the violence that erupted after the last election in 2011, 
			when 800 people were killed and 65,000 displaced in the mainly 
			Muslim north. 
			 
			INEC chairman Attahiru Jega said he was investigating the Port 
			Harcourt complaints, which alleged that opposition agents were 
			kicked out of vote-tallying meetings. 
			 
			In Kaduna, the northern city worst-hit by the 2011 post-election 
			violence, the streets were virtually devoid of traffic and many 
			shops were shuttered. 
			
			
			  
			
			(Additional reporting by Bate Felix in Kaduna, Ardo Abdallah in 
			Bauchi, Julia Payne and Tife Owolabi and in Port Harcourt; Editing 
			by Janet McBride and Giles Elgood) 
			
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