HANGU, Pakistan - Pakistani troops killed at least 34 militants after about 150 Taliban attacked a military checkpost in the northwest on Friday, challenging government assertions crackdowns have weakened the group. Homegrown Taliban rebels are seeking to topple the U.S.-backed government of unpopular President Asif Ali Zardari, who has been pressured to hand over some of his key powers, such as dissolving parliament and appointing military chiefs. A senior military officer and four paramilitary soldiers were also killed in the attack in Orakzai, a day after Pakistani jets killed nearly 50 people, mostly militants, in strikes on a school and a seminary in the same region, a government official said. Fourteen soldiers were wounded in the Taliban assault. Orakzai, one of seven Pakistani tribal regions near the Afghan border, also known as agencies, has seen a surge in military attacks in recent months, targeting militants who were driven out of their bastion of South Waziristan. Pakistan mounted two offensives last year in the northwestern Swat Valley and in South Waziristan on the Afghan border, which it says threw al Qaeda-linked militants into disarray. But despite losing ground, the Taliban hit back with bombings that killed hundreds, prompting troops to step up attacks in other northwestern regions where militants are believed to have taken refuge after offensives.