There is strong evidence that dozens of people have been buried in mass graves in and near the Burundian capital, Amnesty International said Friday.

Satellite images, video footage and witness accounts indicate that the bodies were buried in mass graves, according to the rights group.

"These images suggest a deliberate effort by the authorities to cover up the extent of the killings by their security forces and to prevent the full truth from coming out," said Muthoni Wanyeki, Amesty's regional director for east Africa.

Amnesty quoted residents of pro-opposition Bujumbura neighbourhoods as describing how police killed alleged government opponents and took the bodies to undisclosed locations in December.

Burundi has been gripped by violence since President Pierre Nkurunziza announced in April that he would seek a third term in office, despite the constitution setting a two-term limit.

Meanwhile, British photojournalist Philip Edward Moore and French journalist Jean Philippe Remy were arrested in Nyakabiga, one of the pro-opposition neighbourhoods, police said.

Le Monde said both journalists were on assignment for the French newspaper and demanded their immediate release.

Deputy police spokesman Moise Nkurunziza told dpa by telephone that Moore was with a group of "criminals" and fled with them on Thursday as police were approaching.

Police caught up with some members of the group, arresting the journalist and four other people, two of who were armed with pistols, according to the spokesman.

Remy then showed up at the place Moore had fled from, and was also arrested.

The fact that Moore fled made police suspect that the two had links with the "criminals," Nkurunziza said.

Burundian police often call government opponents criminals.

Both journalists were being questioned and would be released soon, if they were not found to be guilty of anything, the spokesman said.

More than 400 people have been killed in violent protests, clashes between police and government opponents, and attacks since April, according to the UN.

Related stories

Burundian human rights group identifies 14 mass graves

Latest news

New Zealand PM: We need migrants as 'locals can't pass drug tests'

New Zealand Prime Minister Bill English said Monday his country has to rely on immigrant workers because many locals can't pass workplace drug tests.

No early parliamentary election in Serbia this year - media

There will be no early parliamentary election in Serbia this year, electronic media in Belgrade said on Sunday.

Full list of 2017 Oscar winners

A list of winners at the 89th Academy Awards:

"Moonlight" wins best picture after on-stage Oscars mixup

The coming-of-age drama about an African American boy growing up gay in a poor neighbourhood in Miami was made for just 1.5 million dollars. Its director and co-writer, Barry Jenkins, hadn't made a film in years. And it was up for the best picture prize against "La La Land," the smash hit musical that tied the record for Oscar nominations this year.

Emma Stone is best actress in winning night for 'La La Land'

Emma Stone won the best actress Oscar at the 89th Academy Awards for her role in the movie musical "La La Land" on Sunday.

Casey Affleck wins best actor at Oscars

Casey Affleck won the best actor trophy at the Oscars in Los Angeles on Sunday for his portrayal of a taciturn janitor with a troubled past in "Manchester by the Sea."

Thousands of Romanians revive anti-government protests

Thousands of Romanians turned out on Sunday to renew their demands for the government to step down amid accusations it is trying to protect corrupt politicians.

Francis, first pope to visit Anglicans in Rome, weighs S Sudan trip

Pope Francis became the first leader of the Catholic Church to visit the Anglican community in Rome on Sunday, where he said he was considering a trip to famine-struck South Sudan.

Ibrahimovic lifts Man United past Southampton in League Cup final

Zlatan Ibrahimovic scored an 87th-minute winner as Manchester United beat Southampton 3-2 in an exciting League Cup final on Sunday.

London screens Iranian director's film amid Oscars boycott

Thousands of people watched a free screeening of Iranian director Asghar Farhadi's film "The Salesman" in London on Sunday to coincide with the Oscars.

Real Madrid stage comeback to stay top; Messi scores in Barcelona win

Lionel Messi scored the winner as Barcelona beat Atletico Madrid 2-1 on Sunday to move top of the Spanish first division.

Dubrovnik Sun Gardens Hotel member of The Leading Hotels of the World

The Dubrovnik Sun Gardens Hotel has joined the Leading Hotels of the World, Ltd., a global hospitality consortium of more than 375 hotels and resorts in over 75 countries.