The attackers sped into a Nigerian town with grenade launchers — their gunfire and explosions shattering the early morning calm.
As terrified residents scattered into bushes in Baga town and surrounding villages, the gunmen unloaded motorcycles from their trucks and followed in hot pursuit.
Residents hid under scant brush. Bullets pierced them.
Some sought refuge in their homes. They were burned alive.
Many who tried to cross into neighboring Chad drowned while trying to swim through Lake Chad.
By the time the weapons went quiet, local officials reported death tolls ranging from hundreds to as many as 2,000 people.