Zeid Ra'ad Al Hussein, whose term expires on Friday, has urged authorities in Kampala to investigate the violence meted on the 33 people who were arrested in the northern town of Arua on August 13th.

He maintained that authorities should investigate allegations of extrajudicial killings, excessive use of force by security operatives and torture in Uganda.

Bobi Wine and 32 others were arrested and charged with treason after allegedly pelting stones at President Museveni's convoy, smashing a window of one of his cars.

Wine's driver was shot dead while waiting in a parked car outside the hotel where the 36-year-old lawmaker and other MPs were staying.

Also Read: Who is Bobi Wine and why has he caused an international outcry?

Deeply concerned

Zeid told reporters on Wednesday that he has "deep concerns about reports regarding events that have unfolded since August 13" in the East African nation, according to AFP.

"I am particularly concerned about allegations that law enforcement agents have tortured and ill-treated some of the detained," he said.

He added: "We have also received accounts of killings, ill-treatment and arrests of persons by law enforcement agents during protests".

Torture

Bobi Wine and the co-accused appeared in Gulu Magistrate Court on Monday and were granted bail. The MP was carried in an ambulance.

The suspects were aided by crutches and showed signs of pain. Wine's lawyers and family told reporters in Kampala that he had been beaten and tortured by security operatives.

Independent investigation?

Zeid told reporters that authorities in Kampala should be "given the chance to show its goodwill" during the investigation.

He said if the probe "seems to be a sham or something not credible", the next call is "something along those lines of (independent investigation)".