Militants ambushed a convoy of trucks heading to Mali’s blockaded capital of Bamako Wednesday, a transportation workers union said, the latest in a crisis that began with sweeping, coordinated attacks by separatist and jihadi forces across the West African nation last month. The attackers opened fire at the convoy of trucks from Morocco carrying fruit, according to Mounir Benazouz, a member of the road transport branch of the Democratic Confederation of Labor union. The fate of the drivers was