Mohammd Javed, another police official, said "the militants were 50-60 in number", adding they had over-powered and beaten security guards before starting the fires.

  

Taliban fighters have carried out a series of strikes on lorries carrying supplies for US and Nato-led foreign forces fighting an insurgency in Afghanistan.

  

The bulk of supplies and equipment required by the foreign troops across the border is shipped through northwest Pakistan's tribal region of Khyber.