Peshawar - A bomb wounded 11 people, mostly children, when it exploded outside a Pakistani girls' school on Thursday, a doctor said.
The bomb went off at the end of the school day as pupils walked into a street lined with fabric shops in the north-western town of Bannu, which has been a flashpoint for Islamist militancy.
Doctor Omar Zeb told AFP that 11 people had been brought to the local hospital - seven primary schoolgirls and four other people who had been outside in the street.
Police official Azad Khan told AFP that at least four girls, two boys and a man had been wounded. Three of them are in serious condition he said.
There was no immediate claim of responsibility but Islamist militants frequently attack girls' schools - usually when the buildings are empty in the evening or during the holidays.
Last October the Taliban shot schoolgirl activst Malala Yousafzai in the head in the north-western Swat valley.
She has largely recovered and now lives in England, where she is enrolled at a private school and has become a global icon for children campaigning for the right to an education.