A nine-year-old child was killed and three other people were wounded on Wednesday when a bomb planted in a sewer exploded in the northwestern Pakistani city of Peshawar, police said.
The blast took place in the Scheme Chowk neighbourhood of Peshawar, the capital of Khyber Pakhtunkhwa province where Taliban militants have waged a campaign of bombing and suicide attacks.
"A nine-year old boy was killed and three others, two children and a man, were wounded in the bomb blast," senior police official Tahir Ayub said.
It was a remote-controlled device, bomb disposal squad chief Hukam Khan said.
Nobody claimed the responsibility for the blast but Islamist militants have carried out several attacks in the area.
Peshawar has a population of 2.5 million people and has long been on the frontline of violence blamed on an insurgency led by Taliban militants opposed to Islamabad's alliance with the United States.
Islamist militants have killed more than 4,900 people across Pakistan since government troops raided an extremist mosque in Islamabad in July 2007.