Burkina Faso’s government announced on Saturday that armed attackers killed nearly 100 civilians in an overnight attack on a village in the north.

In a statement, the government said the assailants truck during the night on Friday, killing residents of the village of Solhan in Yagha province bordering Niger. They also set homes and the market ablaze.

The government described the assailants as terrorists but no group claimed responsibility.

Attacks by jihadists linked to the Islamic State and al Qaeda militant groups in West Africa’s Sahel region have increased sharply since the beginning of the year, particularly in Burkina Faso, Niger and Mali, with civilians bearing the brunt.

The cabinet declared a 72-hour period of national mourning, noting that the provisional toll put the number of people killed at nearly 100.

Over 1.14 million people have been displaced in Burkina Faso in just over 2 years, while the poor arid country is also hosting around 20,000 refugees from neighboring Mali who are seeking safety from jihadist attacks.