KABUL, Afghanistan — The decapitated bodies of a 7-year-old girl and a 12-year-old boy found Friday in the country’s south and east continued a spate of grisly beheadings in Afghanistan this week.

The body of the boy was discovered in the rural Panjwai district of Kandahar Province in the south, where the Taliban retain command of some areas despite regular clearing operations by American and Afghan forces.

Residents and officials said the Taliban had killed the boy because his brother and uncle were members of the local police. The Taliban denied killing him.

There was no immediate explanation for the killing of the girl, whose body was found in a garden in the Tagab district of eastern Kapisa Province, said the governor of Kapisa, Mehrabudin Safi. Mr. Safi said she had been killed Thursday. “So far it is not clear to the security forces who was behind this beheading,” he said. “The Taliban have not claimed responsibility for it.”