Pakistani officials say government troops have killed at least 43 militants in an ongoing operation in the northwestern Khyber tribal region bordering Afghanistan.

Authorities say one of the bases of the militant group Lashkar-e-Islam was destroyed in Saturday's attack.  

Pakistan is under intense U.S. pressure to crack down on militants close to the Afghan border.

Khyber is on the main land route through Pakistan into Afghanistan.

Some information for this report was provided by AFP and AP.