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Police raided the opposition headquarters ahead of a planned press conference
Police in Uganda say they have arrested the main opposition presidential candidate to prevent him from announcing his own election results.
Kizza Besigye was detained during a raid on his party’s headquarters in the capital, Kampala, following Thursday’s tightly contested elections.
Police also fired tear gas to disperse his supporters.
The US urged President Yoweri Museveni, who is seeking to extend his 30-year-rule, to “rein in his police”.
With official results for nearly half of the polling stations declared, Mr Museveni is leading with 62% of the vote, while Mr Besigye has 33%.
Mr Besigye’s supporters say the result is being rigged to rob him of victory.
This is the third time in the space of a week that the opposition candidate has been detained.
He was released on the two previous occasions without being charged.
There is a heavy deployment of soldiers and police in parts of Kampala, says the BBC’s Catherine Byaruhanga in the city.
There have also been reports of some clashes between the security forces and opposition supporters, she adds.
Mr Besigye was arrested because he planned to announce “purportedly final results” in breach of electoral laws, police said in a statement.
His action would have amounted to “disturbing public order”, police said.
US Secretary of State John Kerry telephoned Mr Museveni, and told him that the arrest “calls into question Uganda’s commitment to a transparent and credible election process free from intimidation”, the state department said in a statement.
The US embassy in Uganda condemned the crackdown in a post on its Twitter account.
BBC