A suicide bomber blew himself up outside a government school in Hangu on Monday, killing a teenage boy, officials said.
The incident happened in the Ibrahimzai area of Hangu district and has not yet been claimed by any group.
"A suicide bomber blew himself up near the main gate of a government boys school, killing a young student aged 14," district police chief Iftikhar Ahmad told AFP.
He said the boy sustained serious injuries and was rushed to hospital where he died. A local intelligence official also confirmed the incident.
The Taliban have blown up hundreds of schools, especially for girls, as part of a campaign against secular education in northwest Pakistan in recent years.
But it is not clear whether the latest incident is connected to the militant group or sectarian unrest.