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 not immediately known, Benazouz said. “We have no details.” The government has not confirmed the ambush and no group immediately claimed responsibility for the attack. A security official, speaking on condition of anonymity because he was not allowed to talk to reporters, said the attack took place between Bamako and Bougouni, a town about 175 kilometers (109 miles) from the capital.…