At least three people have been arrested at a protest at the Congolese embassy in central Ottawa on Tuesday.

Police used pepper spray and a stun gun in one instance after rocks were thrown and windows were spray-painted by a group of around 100 protesters Tuesday at 18 Range Road in Sandy Hill.

CTV Ottawa's Catherine Lathem says there were "several dozen" police officers on scene, with reports of the Ottawa police's tactical unit moving in after 5 p.m.

"It was very hectic at the beginning," said Ottawa police Insp. Don Sweet.

Protesters said they were rallying against Canada's lack of action on corrupt elections, exploitative mineral mining and the systematic rapes of women and children in the African country.

"Every eight minutes in the Congo a woman is being raped and kids are being raped," said one.

"We don't want anyone to cheat on our election . . . enough is enough," said another.

The Congolese government says President Joseph Kabila was re-elected but some people are claiming Etienne Tshiskedi is the real winner.

Protesters said they wanted Canada and other countries to investigate the election results.

A protest was held outside the CBC in downtown Ottawa earlier Tuesday about the Canadian media's lack of coverage of these issues, then went to the U.S. embassy before moving to Sandy Hill.

Range Road between Laurier Avenue and Osgoode Street was closed aroun 1 p.m. because of the demonstration.

Similar protests happened in Toronto and London, England.

UPDATE: The protest finished around 6:45 p.m. Tuesday, according to police.

With a report from CTV Ottawa's Catherine Lathem