PESHAWAR: A bomb planted in a car exploded Saturday killing three passengers and wounding two pedestrians in a tribal area on the border with Afghanistan, officials said.

The bomb, which was on a timer, exploded in a moving car at Barqambarkhel village in the Khyber tribal district, they said.

"Three people were killed and two pedestrians were wounded when a time bomb planted in a car exploded," Khyber's top administrative official Shafirullah Khan told AFP.

The wounded were in stable condition, he added.

Local intelligence officials confirmed the incident and the death toll.