KAMPALA, Uganda (AP) — Uganda's President Yoweri Museveni, who has ruled the country for 40 years, had an early lead Friday in a tense presidential election marred by an internet shutdown, voting delays and opposition allegations of ballot stuffing and detentions by security forces.

Provisional results from half of the polling stations tallied so far showed Museveni with more than 70% of the vote while his main challenger Robert Kyagulanyi, the musician-turned-opposition leader best known as Bobi Wine, had 19%, according to the national electoral commission. Wine asked his supporters to “ignore fake results being announced.”

Activists protesting against the election results so far lit bonfires in the capital, Kampala, on Friday afternoon as the provisional results were being announced. The U.S. Embassy issued a security alert urging its citizens to be cautious as security officers were "firing into the air to disperse gatherings".

The 81-year-old Museveni has served the third-longest tenure of any African leader and is seeking to extend his rule into a fifth decade. The aging president’s authority has become increasingly dependent on the military, which is led by his son, Muhoozi Kainerugaba.

Wine, who is calling for political change, said he was unable to leave his house and that his polling agents in rural areas were abducted before the voting started, undermining his efforts to prevent alleged electoral offenses such as ballot stuffing.

Wine was hoping to end Museveni's four-decade rule in an election during which the military was deployed and heavy security was posted outside Wine's house near Kampala, the Ugandan capital, after the vote.

“He is a person of interest. He is a contestant,” police spokesman Kituuma Rusoke told local broadcaster NBS, suggesting heavy security deployment around Wine’s home was for his own security.

Several people were killed and others were injured in a violent incident in central Uganda that involved supporters of two parliamentary candidates, Rusoke said. He said that more than 20 opposition supporters were arrested.

Rusoke also said police had dispersed a group of “rowdy and riotous youth” in Kawempe, an area of Kampala. Witnesses in Kawempe said they heard gunfire as police in the streets dispersed protesters disputing the victory of a rival parliamentary candidate.

The security forces were a constant presence throughout the election campaign, and Wine said authorities followed him and harassed his supporters, using tear gas against them. He campaigned in a flak jacket and helmet due to his security fears.

Wine wrote Thursday on X that a senior official in his party in charge of Uganda's western region had been arrested. He charged that there was “massive ballot stuffing everywhere.”

Rural Uganda, especially the western part of the country, is a ruling-party stronghold, and the opposition would be disadvantaged by not having polling agents present during vote counting.

To try to improve his chances of winning, Wine had urged his supporters to “protect the vote” by having witnesses document alleged offenses at polling stations, in addition to deploying official polling agents.

Wine faced similar setbacks when he first ran for president five years ago. Museveni took 58% of the vote, while Wine got 35%, according to official results then. Wine said at the time that the election had been rigged in favor of Museveni, who has spoken disparagingly of his rival.

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