Democratic Republic of Congo's opposition said on Monday it expected one of its candidates to win the presidential election based on early vote tallies, but the ruling coalition said it was confident its candidate had won the chaotic contest.
The competing claims followed a disorderly election day on Sunday in which many Congolese were unable to vote due to an Ebola outbreak, conflict and logistical problems.
After unofficial tallies started to circulate on social media on Monday, most mobile internet connections in the capital Kinshasa went down, residents said, in a possible move by authorities to stop the information from circulating.
Connections were also slow or down in the eastern city of Goma.
Government officials could not be immediately reached for comment. Authorities have cut the internet in the past, saying they sought to stop rumours from spreading during protests.
The vote is meant to choose a successor to outgoing President Joseph Kabila after 18 years in power and could lead to the vast central African country's first ever democratic transition.
Any disputed outcome could lead to a repeat of the violence that followed the 2006 and 2011 elections and a wider security breakdown, particularly along Congo's borders with Rwanda, Uganda and Burundi, where dozens of armed militia are active.
Vital Kamerhe, the campaign manager to opposition candidate Felix Tshisekedi, said early counting showed Mr Tshisekedi and the other main opposition candidate Martin Fayulu neck-and-neck in the lead, both with over 40 per cent of the vote.
He said the ruling coalition candidate, Emmanuel Ramazani Shadary, who is backed by Mr Kabila, had only about 13 per cent, although a significant part of the vote remained to be tabulated.
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The election is a first-past-the-post system with no run-off.
Nehemie Mwilanya, Mr Kabila's chief of staff and a member of Shadary's campaign, told a news conference on Monday morning that he was confident Mr Shadary had won, although he did not provide specific figures.
"For us, victory is certain," Mr Mwilanya said.
Mr Fayulu's camp has not yet provided specific numbers but Fayulu said late on Sunday that Mr Shadary's camp was "dreaming" if it thought it was going to win.
The most recent opinion poll before the election, released by New York University's Congo Research Group on Friday, showed Fayulu, a former Exxon Mobil manager, leading the race on 47 per cent.
Mr Tshisekedi had 24 per cent and Mr Shadary 19 per cent.
The first partial results are expected from the national electoral commission (Ceni) on Tuesday.
Election day was mostly peaceful despite several violent incidents, including an altercation at a polling place in eastern Congo in which at least three people were killed.
More than 1.2 million Congolese were unable to vote in three opposition strongholds, where the Ceni cancelled the poll last week, citing an ongoing Ebola outbreak and ethnic violence.
However, in the Ebola hotspot of Beni, an opposition stronghold, residents staged a mock presidential election to show the authorities a decision to postpone the vote there due to health fears was unfounded.