′International Security Assistance Forces (ISAF) can confirm that 16 civilians have been killed in the helicopter that crashed earlier today in Kandahar Province,′ ISAF said in a statement.

′There are an additional five casualties whose condition is yet to be confirmed,′ the statement said, adding that no military personnel were amongst the casualties.

The civilian helicopter, which was working for international forces in the region, crashed during take-off from Kandahar province′s airfield.

′There was no indication of the cause of the accident but insurgent action has been ruled out,′ it said.

Meanwhile, A US military helicopter made an ′emergency landing′ near a military base in eastern Konar province on Sunday morning, the US military said in a statement.

′Personnel on the aircraft were initially treated on site and evacuated to the nearest medical facility for further treatment,′ the statement said, but did not say that how many people aboard the chopper were hurt.

The incident came a day after a US fighter jet F-15E crashed in eastern Afghanistan, killing both its crew members.

Six civilian Ukrainians were killed in another crash in southern Helmand province last Tuesday when their helicopter went down near a British military base in the province. Taliban said their fighters had downed the chopper.

Southern region has been the main hub for Taliban insurgents since the ouster of their regime in a US military invasion in late 2001. Thousands of US, British and Afghan soldiers are taking parts in major assaults against the militants in the region since late last month.

In the latest incident in the region, a NATO-led soldier was killed in a roadside bomb blast in the region on Saturday, the military alliance said in a statement on Sunday. It did not reveal the nationality of the soldier.

The Afghan Defence Ministry also said Sunday that its troops backed by international forces killed 35 Taliban militants in an operation in Shah Walikot district of Kandahar province on Saturday.

The combined forces seized a large cache of weapons and explosive materials during the operation, it said.

In another incident, a suicide bomber detonated explosives strapped to his body near a group of border police in the town of Torkham near the Pakistan border in Nangarhar province on Sunday afternoon, killing two police and one civilian, the Interior Ministry said in a statement.

Two civilians and another police officer were wounded in the attack.

No group claimed responsibility for Sunday′s attack.

Taliban militants have relied heavily on the use of suicide and roadside attacks as part of their campaign against the Western-backed Afghan government since the ouster of their regime in late 2001.