US special forces Afghan helicopter 'downed' by Taliban Click to play
BBC's Quentin Sommerville in Kabul says the crash was a significant loss for the international mission A US helicopter carrying US and Afghan special forces has crashed in Afghanistan, killing 38 people, officials in Kabul say. Reports say the Chinook helicopter was shot down by the Taliban.
US sources say most of the 31 Americans who died were from the Navy Seal unit which killed Osama Bin Laden, but are "unlikely" to be the same personnel.
The US has not confirmed the number of dead, which would be the largest single US loss of life in the Afghan conflict.
The Chinook went down overnight in Wardak province, said a statement from President Hamid Karzai's office, giving the numbers of those killed.
It was returning from an operation against the Taliban in which eight insurgents are believed to have been killed.
A senior official of President Barack Obama's administration said the helicopter was apparently shot down, Associated Press news agency said.
An official with the Nato-led coalition in Afghanistan told the New York Times the helicopter was shot down with a rocket-propelled grenade
Nato's worst Afghan moments

• 6 April 2005 - Chinook crash in Ghazni province kills 15 US soldiers and three civilian contractors
• 28 June 2005 - 16 US troops killed when Taliban bring down Chinook in Kunar province
• 16 August 2005 - 17 Spanish soldiers die when Cougar helicopter crashes near Herat
• 5 May 2006 - 10 US soldiers die after Chinook crashes east of Kabul
• 2 Sept 2006 - 14 UK personnel killed when RAF Nimrod explodes following mid-air refuelling
• 18 August 2008 - 10 French soldiers killed in Taliban ambush east of Kabul
• 6 August 2011 - 31 US special forces and seven Afghan soldiers killed in Chinook crash

Source: BBC and news agencies
"The president of the Islamic Republic of Afghanistan expresses his sympathy and deep condolences to US President Barack Obama and the family of the victims," the statement from President Karzai said. President Obama, too, issued a statement paying tribute to the Americans and Afghans who died in the crash.
"We will draw inspiration from their lives, and continue the work of securing our country and standing up for the values that they embodied. We also mourn the Afghans who died alongside our troops in pursuit of a more peaceful and hopeful future for their country," the statement said.
The Nato-led International Security Assistance Force has confirmed the helicopter crash but has not released details of casualties or the cause.
Reports say more than 20 of the US dead were Navy Seals.
A US military source has confirmed to the BBC that they were from Seal Team Six - the same unit which killed Bin Laden in Pakistan in May.
Who are the Navy Seals?

• 2,500 US Navy special forces
• They carry out Sea, Air and Land operations, hence their name
• Origins lie in World War II
• Involved in Vietnam, Panama, Afghanistan, Somalia, Yemen
• Team Six is elite group officially known as the Naval Special Warfare Development Group, or Devgru
• Team Six based near Virginia Beach, members usually have five years of experience, part of Joint Special Operations Command (JSOC )

[*]The team that killed Bin Laden[/*][/list] However, US officials have told both they BBC and AP they do not believe that any of those who took part in the Bin Laden operation were on the downed helicopter. The size of Team Six, an elite unit within the Seals, which is officially called the Naval Special Warfare Development Group, is not known.
Several Air Force personnel, a dog and his handler, a civilian interpreter, and the helicopter crew were also on board, AP reports.
Nato said it was mounting an operation to recover the helicopter and find out why it crashed. It said there had been "enemy activity in the area" where it went down.
A Taliban spokesman said insurgents had brought down the helicopter with a rocket after US and Afghan troops attacked a house in the Sayd Abad district of Wardak where insurgents were meeting late on Friday, Associated Press said.
Sayd Abad, near the province of Kabul, is known to have a strong Taliban presence.
A Wardak government spokesman quoted by AFP news agency agreed with this, saying the helicopter was hit as it was taking off.
A local resident told the BBC Pashto service a rocket hit the helicopter.
"What we saw was that when we were having our pre-dawn [Ramadan] meal, Americans landed some soldiers for an early raid," said Mohammad Wali Wardag.
"This other helicopter also came for the raid. We were outside our rooms on a veranda and saw this helicopter flying very low, it was hit by a rocket and it was on fire. It started coming down and crashed just away from our home close to the river."
There are currently about 140,000 foreign troops - about 100,000 of them American - in Afghanistan, fighting the Taliban insurgency and training local troops to take over security.
All foreign combat forces are due to leave Afghanistan by the end of 2014 and some troop withdrawals have already taken place.
Nato has begun the process of handing over control of security in some areas to local forces, with Bamiyan becoming the first province to pass to Afghan control in mid-July.
An increase in US troop numbers last year has had some success combating the Taliban in the south of Afghanistan, but attacks in the north, which was previously relatively quiet, have picked up in recent months.
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