Six people died and more than 30 others were injured after a building collapsed in northeastern Rwanda, police said Wednesday as they called off rescue efforts a day after the accident.

"Six people working on the site died as the result of the building collapse," Rwanda's police said in a statement. "The search and rescue mission...has been completed and the site is clear."

Around 100 people are feared trapped after a four-story building under construction collapsed in northeastern Rwanda, the government said Tuesday.

"So far, the tentative information we have indicates that debris fell on about 100 people, we are yet to come up with the exact figures," Rwandan Minister of Disaster Management Seraphine Mukantabana told Agence France Presse.

Angelina Jolie joined British Foreign Secretary William Hague to visit Rwanda on Monday in a bid to encourage world powers to do more on tackling rape and sexual assault in war zones.

Britain's Foreign Office released a picture of the U.S. film star and Hague getting off a British-flagged jet in the central African country.

Rival factions of Democratic Republic of Congo's M23 rebel movement on Saturday clashed again in the country's volatile east after a week of calm, one of the sides said.

Fighting within M23 ranks first broke out in late February, after the dismissal of its political leader, Jean-Marie Runiga, when his supporters clashed with those of the movement's military chief, Sultani Makenga.

Democratic Republic of Congo's M23 rebels and government delegations met separately Saturday with Ugandan mediators, a day ahead of a hoped-for resumption of direct talks, Ugandan officials said.

"The two delegations are here finally and we are hoping for a (face-to-face) session tomorrow (Sunday)," said Ugandan defense ministry spokesman Paddy Ankunda.

The U.N. tribunal for Rwanda on Thursday handed a 35-year jail term to a former minister found guilty of genocide, in the court's final trial ruling.

Augustin Ngirabatware, planning minister at the time of the 1994 genocide, was found guilty of genocide, incitement to commit genocide and rape as a crime against humanity.

Democratic Republic of Congo's M23 rebels on Wednesday demanded Kinshasa sign a formal ceasefire, accusing officials of dragging out peace talks to bolster the army's position on the ground.

"The government is refusing to sign a ceasefire," said the rebels' political chief Jean-Marie Runiga told Agence France Presse.

Britain says it is withholding aid for Rwanda after reports of Rwandan involvement with a rebel group in neighboring Congo.

International Development Secretary Justine Greening said Friday that the government won't release a 21 million-pound ($33.6 million) payment amid concerns Rwanda is backing the M23 militia. Greening says Rwanda is breaching "partnership principles."

Regional leaders called on DR Congo rebel group M23 Saturday to end hostilities and leave a key eastern town they seized in a rampant advance that has sparked fears of a wider conflict.

The meeting of east African heads of state went forward without a key player -- Rwandan President Paul Kagame, whose country the United Nations accuses of backing the rebels -- and wrapped up after less than an hour.

The United Nations wants to use drones for the first time to monitor fighting in the eastern Democratic Republic of Congo, where Rwanda has been accused of aiding rebels, officials said Friday.

Peacekeeping chiefs have been in contact with the governments of DR Congo and of Rwanda about the sensitive move, which could set a precedent that would worry other United Nations members, diplomats said.