The attack took place early in the morning at the nation's Namissiguima military base in the province of Sanmatenga.
African and Western powers denounce what they called an "attempted coup" and the EU demands "immediate" release of President Roch Marc Christian Kabore.
Analysts are expecting a tight race that could go to a second round if no candidate wins more than 50 percent of the vote that was dominated by the threat of terrorist attacks.
Some towns weren’t able to conduct voting at all, including Bartiebougou and Tin Akoff, where 14 soldiers were killed in an ambush by Daesh earlier this month.
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