Roundup of opposition activists took place in May around date of swearing-in ceremony for President Yoweri Museveni

A new wave of repression in Uganda has led to the abductions of dozens more opposition activists by security forces and at least one alleged death. Several hundred people are thought to have been detained without trial in the east African country in secret prisons where they are subjected to a brutal regime of mistreatment. The country has suffered a series of crackdowns aimed at stamping out dissent since campaigning began for presidential elections late last year.

The trigger for the most recent repression by security services appears to have been the swearing-in ceremony of Uganda’s veteran president, the 76-year-old Yoweri Museveni, in May.

Exclusive: victims and relatives describe suffering as repression intensifies under Yoweri Museveni

Hundreds of ordinary people suspected of supporting opposition politicians in Uganda have been snatched off the streets by security services in the worst wave of repression in the east African country for decades.

Many suffered systematic torture, detention in harsh conditions in often secret prisons and the denial of access to relatives or lawyers. The abductions, which were described in detail to the Guardian by survivors and relatives of victims, have led the UK and the US to express concern through diplomatic channels.

Party lawyer accuses re-elected president Yoweri Museveni of being an ‘agent of violence’

The Ugandan opposition leader and presidential challenger Bobi Wine has filed a petition at the country’s highest court to challenge the re-election of Yoweri Museveni in last month’s polls.

Wine, whose real name is Robert Kyagulanyi Ssentamu, wants the supreme court in the capital, Kampala, to nullify the victory of Museveni in the 14 January poll.

Judge ruled on Monday that house arrest of presidential challenger was illegal

Security forces in Uganda have withdrawn from around the home of presidential challenger Bobi Wine, complying with a ruling by a judge on Monday that rebuked authorities for holding the candidate under house arrest for 11 days.

Wine, whose real name is Robert Kyagulanyi Ssentamu, has been unable to leave his home since 14 January, when Ugandans voted in an election in which the 38-year-old reggae star turned politician was the main challenger to 76-year-old Yoweri Museveni.

Opposition candidate urges citizens to reject result of ‘most fraudulent election in country’s history’

Uganda’s president, Yoweri Museveni, won a sixth term in office on Saturday, extending his 35-year-rule in one of the country’s most turbulent election campaigns while his main rival Bobi Wine alleged widespread fraud and rejected the result.

Museveni won 59% of the vote, consolidating his grip on power and becoming one of the world’s longest serving leaders. Wine won 35%, according to the electoral commission’s final results from Thursday’s poll.

Opposition leader tweets ‘we are under siege’, while President Yoweri Museveni takes early lead in election

Soldiers have stormed the home of Bobi Wine, the Ugandan opposition leader has said, as votes continued to be counted in the country’s election.

“We are under siege,” the pop star turned politician tweeted. “The military has jumped over the fence and has now taken control of our home.”