NIAMEY, Niger—Gunmen killed at least 100 people in a northern Burkina Faso village, the government said Saturday, in what was the country’s deadliest attack in years. The attack took place Friday evening in Solhan village, in the Sahel’s Yagha province, government spokesman Ousseni Tamboura said in a statement blaming jihadists. The local market and several homes were also burned down in the area toward the border of Niger, he said. President Roch Marc Christian Kabore called the attack “barbaric.” This is the deadliest attack recorded in Burkina Faso since the West African country was overrun by jihadists linked to al-Qaida and the Islamic State about five years ago, said Heni Nsaibia, senior researcher at the Armed Conflict Location & Event Data Project. “It is clear that militant groups have shifted up gears to aggravate the situation in Burkina Faso, and moved their efforts to areas outside the immediate reach of …