Pakistani officials say a U.S. drone strike killed at least four militants in the lawless tribal belt Tuesday, while seven soldiers died in attacks in different parts of the country.

Officials in North Waziristan tribal district said the drone strike completely destroyed a house near the region's main town of Miranshah.

North Waziristan is a known sanctuary for al-Qaida and Taliban militants.

Elsewhere, two separate bomb blasts killed seven government soldiers. The deadliest attack occurred in the Turbat area of the southwestern Baluchistan province when a roadside bomb killed five paramilitary troops and wounded at least five others.

Another bomb blast killed at least two Pakistani soldiers and wounded as many as 15 others in North Waziristan. Pakistani officials say unknown militants set off the bomb near an army vehicle early Tuesday.

No group has claimed responsibility for the attack.

Meanwhile, the Pakistani army says it is continuing its air and ground offensive in the Kurram tribal region bordering Afghanistan in an attempt to clear the area of militants and reopen a road connecting the upper and lower parts of the district.

On Monday, Pakistani officials said dozens of Taliban militants entered northwest Pakistan from Afghanistan and attacked a military checkpoint. One soldier and at least two militants were killed in the attack before Pakistani forces pushed the militants back into Afghanistan.