Afghan authorities say roadside bombs have killed 14 civilians, five policemen, and one member of the U.S.-led international military coalition in southern Afghanistan.
Ahmad Jawed Faisal, the spokesman for Kandahar Province, said a minivan ran over one bomb in the Arghistan district near the Pakistani border.
He said the other bomb went off after a tractor, which had stopped to aid the dead and wounded, struck another bomb.
No group has claimed responsibility for the attack.
The NATO soldier died in a separate roadside-bomb explosion in southern Afghanistan on July 7.
The five policemen were killed while attempting to join in a gun battle with insurgents at a checkpoint in the Musa Qala district of Helmand Province.
Their vehicle hit a roadside bomb as they were on their way to reinforce fellow police under attack at the checkpoint early on July 8.
The incidents come just a day after bomb blasts and a rocket attack in southern Afghanistan killed 11 civilians, including at least four children.
According to the United Nations, 3,021 Afghan civilians died in 2011, the deadliest in the Afghan war.
This year, casualties have decreased by 36 percent -- a figure the UN says is still too high.
Based on reporting by AFP and AP