An Air Algerie jetliner carrying 116 people crashed Thursday in a rainstorm over restive Mali, and its wreckage was found near the border of neighboring Burkina Faso — the third major international aviation disaster in a week.

The plane, owned by Spanish company Swiftair and leased by Algeria’s flagship carrier, disappeared from radar screens less than an hour after takeoff, en route from Burkina Faso’s capital of Ouagadougou to Algiers.

French fighter jets, U.N. peacekeepers and others hunted for signs of wreckage of the MD-83 plane in the remote region, where scattered separatist violence may hamper an eventual investigation into what happened.

The wreckage was found about 31 miles from the border of Burkina Faso near the village of Boulikessi in Mali, a Burkina Faso presidential aide said.

“We sent men with the agreement of the Mali government to the site, and they found the wreckage of the plane with the help of the inhabitants of the area,” said Gen. Gilbert Diendere, a close aide to Burkina Faso President Blaise Compaore and head of the crisis committee set up to investigate the flight.

“They found human remains and the wreckage of the plane totally burnt and scattered,” he said.

He said rescuers went to the area after they had heard from a resident that he saw the plane go down 50 miles southwest of Malian town of Gossi. Burkina Faso’s government spokesman said the country will observe 48 hours of mourning.

“We found the plane by accident” near Boulikessi, said Sidi Ould Brahim, a Tuareg separatist who travelled Thursday from Mali to a refugee camp for Malians in Burkina Faso. “The plane was burned, there were traces of rain on the plane, and bodies were torn apart,” he said.

Before vanishing, the pilots sent a final message to ask Niger air control to change its route because of heavy rain, Burkina Faso Transport Minister Jean Bertin Ouedraogo said.

The vast deserts and mountains of northern Mali fell under control of ethnic Tuareg separatists and then al-Qaida-linked Islamic extremists after a military coup in 2012.

The French-led intervention scattered the extremists, but the Tuaregs have pushed back against the authority of the Bamako-based government. Meanwhile, the threat from Islamic militants hasn’t disappeared, and France is giving its troops a new and larger anti-terrorist mission across the region.

A senior French official said it seems unlikely that fighters in Mali had the kind of weaponry that could shoot down a jetliner at cruising altitude. While al-Qaida’s North Africa branch is believed to have an SA-7 surface-to-air missile, most airliners would normally fly out of range of these shoulder-fired weapons.

Swiftair, a private Spanish airline, said the plane was carrying 110 passengers and six crew: two pilots and four flight attendants.

The passengers include 51 French, 27 Burkina Faso nationals, eight Lebanese, six Algerians, five Canadians, four Germans, two Luxembourg nationals, one Swiss, one Belgian, one Egyptian, one Ukrainian, one Nigerian, one Cameroonian and one Malian, Ouedraogo said. The six crew members are Spanish, according to the Spanish pilots’ union.