Heavy US reliance on private security in Afghanistan has helped to line the pockets of the Taliban, a US Senate report says.
Private security guards are often used to guard compounds or convoys
The study by the Senate Armed Services Committee says this is because contractors often fail to vet local recruits and end up hiring warlords.
The report demands "immediate and aggressive steps" to improve the vetting and oversight process.
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Some 26,000 private security personnel, mostly Afghans, operate in Afghanistan.
Nine out of 10 of them work for the US government.
Private security firms in Afghanistan provide guards for everything from diplomatic missions and aid agencies to supply convoys.
In August, Afghan President Hamid Karzai gave private security companies four months to end operations in Afghanistan.
'Mr White'
"All too often our reliance on private security contractors in Afghanistan has empowered warlords, powerbrokers operating outside Afghan government control," Democratic Senator Carl Levin, chairman of the Senate committee, said.
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Analysis
Dawood Azami
BBC World Service editor, Kabul
The US Senate investigation confirms President Karzai's view that private security firms undermine Afghanistan's police and army.
Preparations are under way to absorb most members of security firms into the two forces.
But the police and army already struggle to find new recruits; one reason for this is that a private security guard can earn four times as much compared to a policeman.
The US has said it shares President Karzai's goal to close security firms, but wants to move more slowly than his target of the end of 2010.
President Karzai's decree allows embassies and other international offices to keep private security guards inside their compounds.
The plan is that, after the closure of security firms, Afghan security forces will escort supply convoys and other foreigners working in the country.
"These contractors threaten the security of our troops and risk the success of our mission," he added.
The report found that some contractors have had little training, while others were warlords linked to "murder, kidnapping, bribery and anti-coalition activities".
The document gives several notorious examples, including a man the Americans nicknamed Mr White - after a character in the violent film Reservoir Dogs - and his two brothers.
Mr White, who was hired to help guard Shindand airbase in the western Afghan province of Herat, was killed in 2007 by a rival Afghan security contractor.
The Americans then employed his brother, who was known as Mr White II. He is suspected of having funded the insurgents, and was eventually killed in a US raid on a Taliban meeting.
Cppied by http://www.bbc.co.uk/news/world-south-asia-11498443
