Uganda's opposition leader Bobi Wine says his party will challenge president Yoweri Museveni's claimed election win late last week. Two people have been killed in protests over the allegedly "cooked-up" result.

Wine said the election was the "most fraudulent in Uganda's history." Over the weekend the singer-turned-politician's house was surrounded by army and police and his party claimed he and his wife were under house arrest.

Museveni was reelected president after late last week's poll was marred by violence and allegations of fraud.

The Election Commission announced over the weekend Museveni, 76, in power since 1986, got 59% of the vote to seal his sixth successive term.

Robert Kyagulanyi Ssentamu, better known by his stage name, Bobi Wine, 38, got the second most votes with 35%.

Speaking late last week Wine said the interim result showing him losing was "a joke" and declared himself president-elect. "We secured a comfortable victory," he said from the capital Kampala.

"I am very confident that we defeated the dictator by far. The people of Uganda voted massively for change of leadership from a dictatorship to a democratic government. But Museveni is trying to paint a picture that he is in the lead. What a joke!"

Shortly after soldiers surrounded his home, saying they wanted to protect him.

EC chairperson, Simon Byabakama said Wine must prove his electoral fraud allegations. "The onus is upon candidate Kyagulanyi to show or prove in what context and how the results are rigged," he said.

Al Jazeera quoted a government representative Ofwono Opondo denouncing Bobi Wine's claims. "This is what we expected before," Opondo said. "Even before we went into polling, he said the election would be rigged. These are allegations that we are used to in Ugandan elections. Nothing new."

The campaign saw about 50 people killed - mainly supporters of Wine - after clashes with security forces. The government also banned the internet saying that it was in response to Facebook's decision to block accounts that were promoting the president and his National Resistance Movement party.

About 10.3 million of the 18.1 million registered voters cast ballots. The United States and European Union did not observe the election but the African Union and East African Community did.