KABUL, Afghanistan (AP) — The Taliban detonated a bomb on a fuel tanker Wednesday and then opened fire on other NATO supply trucks, destroying 22 vehicles loaded with fuel and other goods for U.S.-led coalition forces in Afghanistan.

Elsewhere in the country, a suicide bomber killed three Afghan soldiers at a checkpoint in the east, while militants killed nine more government troops in an ambush in the south. Three NATO service members were also killed in insurgent attacks.

The violence comes as Afghan forces are taking charge of security in more areas across the country ahead of the planned withdrawal of the U.S.-led coalition's combat forces by the end of 2014. To show they remain a resilient force, insurgents are conducting targeted attacks, even in relatively peaceful parts of the country.