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Pakistani troops have fired warning shots at two US helicopters forcing them back into Afghanistan, local Pakistani intelligence officials say.

The helicopters flew into the tribal North Waziristan region from Afghanistan's Khost province at around midnight, the reports say.

Tensions have risen after an increase in US attacks targeting militants.

The incident comes amid mounting security fears after a militant bomb attack on the Islamabad Marriott hotel.

Pakistan's army has said it will defend the country's sovereignty and reserves the right to retaliate to any border violations.

The government has said it will take targeted action against the militants, promising raids in some "hotspots" near the border with Afghanistan.

Meanwhile in the city of Peshawar, Afghan consul Abdul Khaliq Farahi was kidnapped after six unidentified men ambushed his car, officials say. His driver died in the attack.