Some unidentified gunmen have killed at least 37 people and wounded over 60 in an attack on a mining company convoy in Burkina Faso.
Wednesday's attack happened in eastern Burkina Faso, about 25 miles (40 kilometres) from the Boungou mine, which is owned Canada's Semafo company.
A security source said "a military vehicle that was escorting the convoy hit an explosive device".
The mine itself, it added, remained secure and its operations had not been affected.
The convoy, escorted by military personnel, included five buses transporting Semafo employees, contractors and suppliers.
The attack is the third related to Semafo in the past 15 months, after two incidents previous year left at least seven people dead. The state will provide further details later on Thursday, while Semafo said it will issue an update "when complete details are known".
This attack marks the fourth in 15 months, including an attack in December that resulted in five deaths and another on August 13, 2018 that resulted in six.
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It used to be the third lethal attack suffered by Semafo in 15 months within the West African nation, which is combating a jihadist rise up that has claimed a total bunch of lives. As part of the changes, it said all expatriate employees travelling between Burkina Faso's capital of Ouagadougou and Boungou mine would be transported by helicopter while a military force would be deployed on the ground to protect its local employees travelling by road.
The Montreal-based company has two locations in the African country, which has been engulfed in jihadist violence for almost five years.
The country's northern provinces have been battling a four-year-old wave of jihadist violence that came from neighboring Mali.
The area has become increasingly precarious for Semafo, which operates two gold mines in Burkina Faso. More than 630 people in the country have died in regular attacks that include raids on villages, road mines and suicide bombings. Attacks are usually attributed to groups affiliated with al-Qaeda in the Islamic Maghreb, GardaWorld said.
Nearly 500,000 people have also been forced to flee their homes.
On Monday, an attack on a unsuitable in northern Burkina Faso killed a minimal of five gendarmes and five civilians.