"Seven ISAF soldiers are known dead after a Chinook helicopter flying an ISAF mission went down in Helmand province near Kajaki just after 9:00 pm (1630 GMT)," it said.

The location was the same as that given by the insurgent Taliban movement, which is confirmed to have brought down only one military aircraft in Afghanistan.

"The entire crew of five died in the incident. There were also two military passengers who died," ISAF said in a statement.

The 37-nation ISAF does not release the nationalities of its casualties until their home nations have done so.

Most of the 5,200 British troops in Afghanistan under ISAF are in Helmand.

A unit that responded to the scene of the crash was ambushed by "enemy fighters," the statement said. "Under continued fire, the responding patrol called for an airstrike to eliminate the enemy threat."

An Afghan civilian was injured by gunfire after the crash, it said.

Taliban spokesman Yousuf Ahmadi said "our Taliban brothers" had shot down an aircraft, which he said appeared to be a Chinook, in Kajaki in Helmand.

The twin-engined Chinook transport helicopters can carry up to 30 people and are in regular use over Afghanistan.

"The helicopter burst into flames in the sky and then crashed. It seems that no one on board could have survived," Ahmadi said.

"The foreign troops have cordoned the area and are in control of the crash site so we cannot have access to the area to determine the number of casualties," he told AFP by telephone.

He said he did not yet know exactly how the aircraft had been brought down.

Taliban fighters have anti-aircraft weapons from the "jihad time," the period of resistance to the Soviet occupation of the 1980s, he told AFP.

Also, "they have received new anti-airplane weapons."

"At this stage I don't have the exact information which weapons they used to bring down the aircraft," he said.

The insurgent movement has previously claimed to have shot down foreign military aircraft but this has mostly been rejected by the international forces which have, however, lost several aircraft to accidents or technical failures.

In one incident acknowledged to have been caused by Taliban, militants used a rocket-propelled grenade to shoot down a US Chinook helicopter in Kunar in June 2005, killing all 16 soldiers on board, eight of them US Navy SEALs.

It was the first downing of a US helicopter by hostile fire in Afghanistan and the biggest toll for US forces from a single attack since the Taliban regime was toppled in a US-led invasion in late 2001.

There have been suspicions that the militants, who are allied with Al-Qaeda, are trying to acquire shoulder-fired anti-aircraft weapons for their fight against the NATO force and the separate US-led coalition.

In March this year, the coalition said it carried out precision air strikes on Taliban militants who had been helping to move anti-aircraft weapons in Helmand, killing some of them.

Helmand has seen a surge in military and Taliban activity this year with hardcore Taliban said to be allied with drugs barons and foreign fighters in the province, the country's top opium producer.

The latest deaths take to 73 the number of foreign soldiers killed in Afghanistan this year, most of them in combat.

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