* Third "friendly fire" incident in more than a month
* Suicide bomber kills 2 Afghan police, one civilian
* More than 10 suspected militants killed in raid
(Updates with detail on suicide attack, toll)
By Michelle Nichols
KABUL, Jan 10 (Reuters) - A foreign force air raid in central Afghanistan may have killed three Afghan police and wounded three, the NATO-led force said on Monday, the third such incident in more than a month.
Civilian casualties and the mistaken killing of members of the Afghan security forces have been a frequent source of friction between President Hamid Karzai's government and Western military forces in a war now in its 10th year.
In southern Kandahar's Spin Boldak town -- scene of the country's deadliest insurgent attack in nearly six months late last week -- a suicide bomber killed two policemen and a civilian, the Interior Ministry said.
Violence in Afghanistan is at its worst since late 2001 when U.S.-backed Afghan forces overthrew the Taliban for refusing to hand over al Qaeda militants, including Osama bin Laden, after the Sept. 11 attacks on the United States.
Foreign troops on patrol in Daykundi province on Sunday called in an air strike after seeing nine people setting up what appeared to be an ambush, the NATO-led International Security Assistance Force (ISAF) said.
It was later determined the raid may have targeted Afghan police, it said.
"While we take extraordinary precaution while conducting operations to avoid friendly casualties, it appears innocent people may have been mistakenly targeted," senior ISAF spokesman Colonel Rafael Torres said in a statement.
The air strike in Daykundi, a remote province west of Kabul, is the third such incident in more than a month. On Dec. 8, the Afghan Defence Ministry condemned a foreign air raid in Logar province it said killed two of its soldiers and wounded five. [ID:nSGE6BF04Y]
Less than a week later, on Dec. 16, the Defence Ministry said a U.S. air strike in southern Helmand province had killed four Afghan soldiers. [ID:nSGE6B707O]
Violence has surged in Afghanistan with record casualties on all sides. Last year, 711 foreign soldiers were killed, according to monitoring website www.iCasualties.com, up from 521 in 2009.
Afghan security forces have been hit even harder. A total of 1,292 police and 821 soldiers were killed in 2010, according to the Afghan government.
Ordinary Afghans, however, have borne the brunt of the fighting. The United Nations has said 2,412 civilians were killed and 3,803 wounded in the first 10 months of last year, a 20 percent increase over 2009.
The government has said 5,225 insurgents were killed last year.
SUSPICIOUS VEHICLE
In southern Kandahar, a suicide bomber detonated his explosives as Afghan police surrounded his vehicle in Spin Boldak on Monday morning, killing two policemen and a civilian, the Interior Ministry said.
The police had pursued the bomber after deciding his vehicle looked suspicious, it said. Police had earlier said three policemen had been killed.
Spin Boldak, a major crossing point on the border with Pakistan has seen frequent militant attacks.
On Friday, a suicide bomber killed 17 people, including a police commander, and wounded 21, inside a public bathhouse in Spin Boldak, the worst insurgent attack since late July. [ID:nSGE706060]
Separately, foreign and Afghan troops killed more than 10 suspected insurgents during a raid in the northern province of Kunduz on Sunday, ISAF said in a statement.
The Taliban-led insurgency has spread out of its traditional strongholds in the south and east over the past two years into once peaceful areas of the north and west. The north in particular has become a deadly new front in the war. (Additional reporting by Ismail Sameem in Kandahar; Editing by Jonathon Burch) (If you have a query or comment about this story, send an e-mail to news.feedback.asia@thomsonreuters.com)
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