KABUL, March 7: US forces in Afghanistan used excessive force during arrests of suspected Islamic militants, resulting in avoidable civilian deaths and possibly violating international law, Human Rights Watch said on Monday.

A report by the US-based group said at least 1,000 Afghans and foreigners had been detained from 2002 by US-led forces in Afghanistan, some of them subjected to torture and denied the right to challenge their detention.

While many have been released, some remain in detention in Afghanistan and Guantanamo Bay, the US naval base in Cuba. But a US military spokesman in Afghanistan said the report indicated a 'lack of understanding' of armed conflict laws.

"The (US-led) coalition takes seriously now and has taken seriously in the past all reports of the use of excessive force and any inappropriate or wrongful behaviour by our forces," Lieutenant-Colonel Bryan Hilferty told Reuters.

"Afghanistan is currently a combat zone, and forces here are engaged in combat operations against determined enemy forces. We apply appropriate rules of engagement for combat operations and are in full compliance with the law of armed conflict."

In criticisms echoing international condemnation of Guantanamo Bay, the report said detainees in US detention centres at the Bagram air base and elsewhere in Afghanistan were denied access to families, lawyers and journalists.

It also said three people had died while in US custody in Afghanistan, and criticized the US military for failing to investigate the deaths properly and make public its findings.

Around 13,000 US-led troops are hunting remnants of the ousted Taliban and Al Qaeda network. Afghans accuse them of heavy-handedness, and the US military admits causing civilian deaths in botched operations. Afghans say around 300 people have died this way since late 2001, but the US military rejects some of the allegations.

Little is known about US detention centres in the country. "The United States operates its detention facilities in Afghanistan in a climate of almost total impunity," the report said.

Human Rights Watch quoted a UN official who collected complaints about US operations in 2002 as saying US forces used 'cowboy-like excessive force' against Afghans, most of whom turn out to be law-abiding citizens.

It details the case of Ahmed Khan, a resident of Zormat district in the eastern Paktia province, whose house was rocketed and hit by helicopter machine guns in July, 2002 before Khan was arrested with two teenage sons.

Hoods were put over their heads and they were flown to Bagram base, north of Kabul, from where they were later released. During the raid a farmer was killed by gunfire and a woman hurt.

The report criticized 'suppressing', or indiscriminate fire used during arrest operations to immobilize possible enemy forces. It also said US troops sometimes detained all men of a military age found in the vicinity of an operation.

Former detainees complained of being photographed naked, deprived of sleep for several weeks, beaten unconscious, held in solitary confinement and shackled.

Five men held for 16 days in 2002 and later released were given the equivalent of 70 US cents each by a local interpreter after an American apologized to them and promised compensation.

Human Rights Watch called on the United States to publicly identify places in Afghanistan where US forces and the CIA were holding suspects, to ensure detainees were treated according to international law and to allow families and lawyers to see them. -Reuters