Airstrikes on a cave complex near Afghanistan's border with Pakistan killed four Taliban militants and destroyed a truck loaded with rockets, the US military said.
Military officials in Pakistan at first said that helicopters fired missiles into Pakistani territory, and that officials had opened an investigation into whether US aircraft were involved.
But Maj Gen Shaukat Sultan, Pakistan's top army spokesman, later said no missiles had landed in Pakistan. He did say that three Pakistani tribesmen were wounded on the Afghan side of the border and were taken to a hospital.
Lt Col Paul Fitzpatrick, a US Military spokesman, said the strike was one or two km inside the Afghan border.
A US military statement said coalition forces were in direct communication with Pakistani forces on the other side of the border during today's operation.
Past US Strikes into Pakistan's territory have strained relations between the two countries.
"It was close to the border, within a kilometre or two. But we have GPS (global positioning systems). We know where the borders are of the two counties," he said.
Before the strike, a joint team of US Ground forces and Afghan soldiers observed individuals loading a truck near the cave with rockets, a military statement said.
{{/usCountry}}Before the strike, a joint team of US Ground forces and Afghan soldiers observed individuals loading a truck near the cave with rockets, a military statement said.
{{/usCountry}}A patrol sent to investigate after the strike was fired on by one militant, who was captured, the US Military said. More militants could be buried under the rubble in addition to the four militants known to have been killed, the military said.