This article is from the source 'bbc' and was first published or seen on . It will not be checked again for changes.

You can find the current article at its original source at http://news.bbc.co.uk/go/rss/-/1/hi/world/south_asia/7635893.stm

The article has changed 7 times. There is an RSS feed of changes available.

Version 2 Version 3
Pakistan 'fires on Nato aircraft' Pakistan fires on Nato aircraft
(about 3 hours later)
Nato forces in eastern Afghanistan say their helicopters have been fired upon by a Pakistani military checkpoint. Pakistan says its troops fired warning shots at two Nato helicopters as they crossed the border from Afghanistan.
The Western alliance said its aircraft had not crossed into Pakistani airspace when they came under fire in Khost province, news agency AP reports. It is the first time the Pakistan army has admitted opening fire near US or Nato forces, as tension grows over cross border military action.
The incident comes amid growing tension over a number of recent incidents at the Pakistan-Afghan border. The Western alliance said its aircraft were not in Pakistani airspace when shots were fired over Khost province.
Earlier this week, Pakistani troops said they had fired warning shots at US helicopters that crossed the border. A Pentagon spokesman said they were US helicopters and that Pakistan would have to explain what had happened.
A drone believed to be operated by the CIA crashed inside Pakistan on Wednesday. 'Routine operations'
In a statement on the latest incident, Nato's International Security Assistance Force (Isaf) said there had been no damage or casualties. Chief Pakistani military spokesman Major General Athar Abbas said that the helicopters had "crossed into our territory in Ghulam Khan area".
"Isaf helicopters received small-arms fire from a Pakistan military checkpoint along the border near Tanai district, Khost, September 25 while conducting routine operations in Afghanistan," it said in a statement. "They passed over our checkpost so our troops fired warning shots," he said.
He added that the matter was being taken up with the Nato-led International Security Assistance Force (Isaf) in Kabul.
The BBC's Syed Shoaib Hasan, in Islamabad, says that the border between Afghanistan and Pakistan is very unclear.
There is an imaginary border called the Durand line which each side marks differently.
Our correspondent says that, in reality, the border is marked by a 3-4km (1-2 mile) stretch of no man's land.
Pakistan says that this is its territory and Afghanistan makes similar claims.
In a statement, Isaf said its helicopters had received small-arms fire from a Pakistan military checkpoint along the border near Tanai district, Khost, on 25 September "while conducting routine operations in Afghanistan".
"At no time did Isaf helicopters cross into Pakistani airspace," it added.
Pentagon spokesman Bryan Whitman said: "The flight path of the helicopters at no point took them over Pakistan."
He said US and Nato officials were speaking to their Pakistani counterparts to determine what had happened and to ensure there was no recurrence.
"The Pakistanis have to provide us with a better understanding of why this took place," he said.
Local tribesmen in the area told the BBC that two helicopters were trying to cross into Pakistani territory near Ghulam Khan, in North Waziristan, when Pakistani troops at posts near the border fired at them.
Correspondents say there is growing anger in Pakistan at US forces in Afghanistan allegedly violating Pakistani sovereignty.
BORDER TENSIONS 3 Sept: First reported ground assault by US troops in Pakistan - Islamabad responds furiously 15 Sept: Pakistani troops reportedly fire in air to stop US troops crossing in S Waziristan 17 Sept: Top US military chief Adm Mike Mullen visits Pakistan to calm tensions16 Sept: Pakistan says it was not told of fresh US missile strike 22 Sept: Pakistani troops in fresh firing to deter US incursion into N Waziristan, officials say25 Sept: Pakistani troops fire warning shots at Nato helicopters on border with Khost The Afghan-Pakistan militant nexusUS attacks raise stakes in Pakistan
There has been growing tension between the two countries since 3 September when the US conducted its first ground assault in Pakistani territory on what it said was a militant target in South Waziristan.
Pakistan reacted angrily to the action, saying 20 innocent villagers had been killed by US troops.
Local officials have said that on two occasions since then Pakistani troops or tribesmen have opened fire to stop US forces crossing the border. The claims were not officially confirmed.
On Wednesday, a drone believed to be operated by the CIA crashed inside Pakistan.
The US and Nato have called on Pakistan to do more to curb militants operating in the border area.