Two bombs were detonated minutes apart Sunday in the capital city of southern province of Helmand, killing three civilians and injuring 20 others, a government official said.
The first bomb was hidden inside fruit and left in Lashkargah's main market, provincial governor's spokesman Daoud Ahmadi said.
"The blast killed one woman and two children and injured 15 other civilians," he said.
Minutes later, a second bomb was remotely detonated close to a school, injuring four civilians and an Afghan soldier, he said.
Ahmadi blamed "enemies of Afghanistan," a common term used by Afghan officials to describe the Taliban insurgents, who were ousted from power in late 2001.
Insurgent bombings have increased by 94 per cent in the first four months of this year, compared to the same period in 2009, according to a report published by the United Nations Secretary General Ban Ki-moon on Saturday.
Separately, the Interior Ministry said Sunday that a rocket fired by "enemies of Afghanistan" hit a residential home in Behsood district of the eastern province of Nangarhar overnight, killing two children and wounding one woman and three men.