Afghan police officer kills 3 U.S. Marines

According to the survey, many Afghan security personnel found U.S. troops "extremely arrogant, bullying and unwilling to listen to their advice" and sometimes lacking concern about Afghans' safety in combat. They accused the Americans of ignoring female privacy and using denigrating names for Afghans.

American troops, in turn, often accused Afghan troops and police of "pervasive illicit drug use, massive thievery, personal instability, dishonesty, no integrity," the survey said.

U.S. military officials have downplayed that survey.

The U.S. hopes the Afghan Local Police, a village defense force backed by the national government, will become a key force in fighting the insurgency.

Just last month, a coalition statement touted the Marines' work training the Afghan Local Police in Sangin, describing a new academy in an Afghan National Police compound near a Marines base.

"During the three-week course, future police train in the basics of patrolling, vehicle and personnel searches, checkpoints, escalation of force, detainee procedures, marksmanship and Afghan law," the statement said. "After completing training, the new ALP are stationed at patrol bases in their hometowns."

Meanwhile Friday, Britain said one of its soldiers died the previous day from wounds he received in a shooting while on patrol in the Nad Ali district of Helmand province. Nineteen coalition troops have been killed in Afghanistan this month.

Elsewhere in Helmand province, six Afghan civilians were killed when their car hit a roadside bomb, one of thousands planted by insurgents across the volatile region. Helmand police official Mohammad Ismail Khan said the bomb killed three children, two women and a man.

The U.S. government identified four Americans who were killed along with an Afghan civilian in a twin suicide attack in eastern Kunar province on Wednesday: USAID foreign service officer Ragaei Abdelfattah, Air Force Maj. Walter D. Gray, of Conyers, Ga.; Army Maj. Thomas E. Kennedy, of West Point, N.Y.; and Command Sgt. Maj. Kevin J. Griffin, of Laramie, Wyo.

The Taliban also claimed responsibility for that attack.