Missiles fired by what is thought to be a U.S. drone killed eight suspected militants and injured an unspecified number of other people in Pakistan's tribal region of North Waziristan on Wednesday morning, Pakistani intelligence sources said.

Four missiles hit a residential compound and a vehicle shortly before noon, the sources said.

North Waziristan, a mountainous region bordering Afghanistan, is part of Pakistan's loosely governed tribal areas and has long been a base for anti-government militants.

The compound that was hit Wednesday was known to house Uzbek militants, a local tribal elder told CNN.

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