(CNN) -- Two suspected U.S. drone strikes in in the Pakistan-Afghanistan border region have killed at least eight militants, Pakistani officials said Saturday. One strike targeted a hideout in eastern Afghanistan, near Pakistan's Khyber Agency, which is part of Pakistan's loosely governed tribal areas, the officials said on condition of anonymity. That strike killed at least four militants and injured many others, the source said. In the other incident, missiles hit a vehicle in Pakistan's North Waziristan -- another tribal area that borders Afghanistan -- killing four militants, including a commander, according to Pakistani intelligence sources. It wasn't immediately clear when the attacks happened. The sources didn't say which group or groups the militants represented. The tribal areas in northwestern Pakistan have long been a base for anti-government militants, including those with the Islamist Haqqani movement. The United States routinely does not comment on suspected drone strikes.
One strike kills four militants in Afghanistan, near Pakistan border, Pakistani officials say . Another four militants killed in northwestern Pakistan, sources say .