According to the Police, the passenger van was en route to Tull from Bannu when it met the road accident.
Rescue teams arrived at the site and transferred the victims to hospital for treatment. Sources informed that the victims have suffered critical injuries.
Local police sources said that the vehicle skidded into the ravine after brakes failure.
Pakistan has worst record of road mishaps in the region most of which happened due to reckless driving and badly maintained roads.