The first incident took place on Monday, when a suicide bomber blew himself up outside a government school in the Shiite-dominated Ibrahimzai area of Hangu district, AFP reported.
It has not yet been claimed by any group, but the Taliban has targeted hundreds of schools in recent years as part of a campaign against secular education in the Northwest.
A local intelligence official confirmed the incident.
Hangu borders Orakzai tribal region, one of Pakistan's seven tribal districts on the Afghan border considered to be the hub of Taliban and Al-Qaeda linked fighters.
