Four people were killed and dozens wounded when an illegal explosives cache blew up accidentally in Ouagadougou, Burkina Faso's top security official said Wednesday.

"Two of the dead have been identified and parts of human remains have been found in the rubble belonging to two (other) people," national security head Omer Batiolo told reporters, ruling out an attack.

Algeria has proposed a regional meeting next week to tackle conflict in Mali after talks with Burkina Faso's leader, who has been mediating in the troubled west African state.

"We offer to launch the initial phase of an inclusive inter-Malian dialogue on July 16 in Algiers, in the presence of ministers from countries in the region," Algerian Foreign Minister Ramtane Lamamra said late Wednesday in Ouagadoudou.

Tens of thousands of people Saturday answered a call by Burkina Faso's opposition to protest against any move by President Blaise Compaore to get a fifth term in office.

Crowds poured into the largest stadium in Ouagadougou, filling it to its 35,000 capacity, voicing their anger against any move by the 63-year-old to extend his decades-long hold on power in the landlocked nation.

The U.S. military's partnership with France in Africa is "indispensable" in the fight against extremist groups in the Sahel region, French Defense Minister Jean-Yves Le Drian said on Friday.

During a visit to Washington, Le Drian said "terrorist groups are circulating across the whole Sahara-Sahel area and terrorist acts could put our own security at risk."

At least 10,000 people marched in Burkina Faso's capital Saturday to protest against plans by President Blaise Compaore that could allow him to extend his mandate by another five years, police said.

The rally in Ouagadougou was called by the opposition over a planned change to the constitution which currently limits the president to two five-year terms. Compaore is set to reach that limit next year.

Mauritania said Wednesday it would send soldiers to the United Nations peacekeeping force charged with ensuring security after elections in conflict-scarred Mali -- but only to areas near their shared border.

The MINUSMA force has replaced an African military mission which had been supporting French soldiers who entered Mali in January to halt an Islamist advance and to help the government re-establish its authority over the vast country.

Mali's army has accused a Tuareg rebel group of breaching a peace accord in the flashpoint northeastern town of Kidal, by attacking civilians and soldiers.

"The MNLA has mobilized women and children in Kidal to throw stones at the black population, African (peacekeeping) troops and Malian soldiers," army spokesman Lieutenant-Colonel Diarran Kone said late on Sunday, referring to the Tuareg separatist National Movement for the Liberation of Azawad (MNLA).

Mali's main Tuareg separatist group said Wednesday it supported the holding of a nationwide presidential poll in July but ruled out allowing the army in its northern bastion of Kidal for the vote.

A delegation from the National Movement for the Liberation of Azawad (MNLA) held talks in Ouagadougou, the capital of neighboring Burkina Faso, with the region's lead mediator in the Malian crisis, Djibrill Bassole.

Burkina Faso's foreign minister collapsed and fell off a platform on Thursday during a live press conference in Ankara with Turkish counterpart Ahmet Davutoglu.

Djibrill Bassole wobbled and fell to the floor, knocking down a stand in front of him, while Davutoglu was responding to a journalist's question.

French warplanes attacked an Islamist base in north Mali at the weekend, wounding four members of the Arab Movement of the Azawad (MAA), after the extremists clashed with Tuareg rebels, MAA and security sources said Monday.

"Four fighters of the MAA were wounded during bombing by the French air force (on Sunday) against our base at Infara," 30 kilometers (19 miles) from the border with Algeria, Boubacar Ould Taleb, a leader of the MAA, told Agence France Presse in the capital Bamako by telephone.