Pakistani troops have fired 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.
Last week Pakistani troops fired into the air to prevent US ground troops crossing the border further south.
The two countries held talks last week on anti-militant co-ordination.
The latest confrontation between US and Pakistani forces took place in North Waziristan's sparsely populated Ghulam Khan district, Pakistani troops kill 16 militants ...
International air strikes kill nine Afghan police ... west of the main town in the region, Miranshah, local officials say.
A Pakistani military spokesman, Maj Murad Khan, said he had no information "on border violation by the American helicopters".
The US military in Afghanistan also said it had no information on the incident.
(BBC)
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