Army says eight soldiers escaped attack on around a dozen vehicles in northwest Bouka Were, around 100 kilometres from border with Mauritania.
The elections in Mali have been repeatedly delayed, eroding trust in institutions as the country struggles with a militant revolt that has claimed thousands of lives and forced hundreds of thousands from their homes.
Officials say the death toll could climb after militants, who arrived on motorbikes and in cars, attacked a military base in the Gao region.
Senior AU official says decision taken because militant "threat is expanding" in Sahel, a semi-arid strip below Africa's Sahara desert.
The disease often infects people after they come into contact with the blood of infected animals and was spotted for the first time in the village of Samoa in late January for the first time.
Mali was hit by two large-scale attacks on the country's military on Friday, in which at least 54 people have been killed. Another attack on a French army convoy in the Indelimane area on Saturday left one French soldier dead.
Northern Mali's population is fast dwindling as people flee desertification, drought and armed conflict only to end up in places where they face increased competition for resources.
Malian authorities revised the death toll down to 35 from a previous estimate of 95. On Monday, a militant group massacred villagers from the Dogon ethnic group in southern Mali.
The number of fatal attacks on the UN peacekeeping forces in Africa has increased in recent years and the recent killing of 10 peacekeepers in Mali is alarming.
The ambush, which involved a car bomb explosion followed by gunfire, took place two days after militants killed at least six people during a raid on a military headquarters in central Mali.
Witnesses claim the incident, that took place in the town of Boulekessi near Mali's border with Burkina Faso, was due to military "blunders" and that "more than 15 civilians were killed," according to a former Malian minister.
More than 80 members of the UN mission, known as MINUSMA, have been killed since 2013 in attacks by militant groups active in the country’s north and center.
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