KABUL, Afghanistan -- Angered by civilian casualties, Afghan President Hamid Karzai said Tuesday he will no longer allow NATO airstrikes on houses, issuing his strongest statement yet against strikes that the military alliance says are key to its war on Taliban insurgents.
The president's remarks follow a recent strike that mistakenly killed a group of children and women in southern Helmand province. He said it would be the last.
"From this moment, airstrikes on the houses of people are not allowed," Karzai told reporters in Kabul.
NATO says it never conducts such strikes without Afghan government coordination and approval. A spokesman for NATO forces in Afghanistan said they will review their procedures for airstrikes given Karzai's statement but did not say that it would force any immediate change in tactics.
"In the days and weeks ahead we will coordinate very closely with President Karzai to ensure that his intent is met," spokeswoman Maj. Sunset Belinsky said. Karzai has previously made strong statements against certain military tactics -- such as night raids -- only to back off from them later.
But if Karzai holds to what sounds like an order to international troops to abandon strikes, it could bring the Afghan government in direct conflict with its international allies.
"Coalition forces constantly strive to reduce the chance of civilian casualties and damage to structures, but when the insurgents use civilians as a shield and put our forces in a position where their only option is to use airstrikes, then they will take that option," Belinsky said.
It is unclear if Karzai has the power to order an end to such strikes. NATO and American forces are in Afghanistan under a United Nations mandate. Negotiations between the United States and the Afghan government on the presence of U.S. forces have become contentious, with Karzai declaring that he will put strict controls on how U.S. troops conduct themselves.
"The Afghan people can no longer tolerate these attacks," Karzai told reporters at the presidential palace.
Asked what he will do if international forces continue to order strikes on houses, Karzai said: "The Afghan government will be forced to take unilateral action." He did not say what that action would be, but said he plans to discuss it with NATO officials next week.
He noted that he has repeatedly told his international allies that civilian deaths from air strikes are unacceptable.
"If this is repeated, Afghanistan has a lot of ways of stopping it, but we don't want to go there. We want NATO to stop the raids on its own, without a declaration ... by the Afghan government, because we want to continue to cooperate," he said.
Karzai said that NATO forces risk being seen as an "occupying force," using the same phrase that Taliban insurgents use to describe the international coalition.
"They must treat Afghanistan as a sovereign nation," Karzai said.
At least nine civilians were killed in Saturday's air strike in Helmand province, according to NATO. Afghan officials have said 14 were killed, including at least 10 children and two women.
NATO officials have apologized for the strike on two houses in Nawzad district, saying their troops thought the targeted compound housed only insurgents when they ordered the strike.
Southwest regional commander U.S. Marine Maj. Gen. John Toolan said that NATO launched the airstrike after an insurgent attack on a coalition patrol in the district killed a Marine. Five insurgents occupied a compound and continued to attack coalition troops, who called in an airstrike "to neutralize the threat," Toolan said.
The troops later discovered civilians inside the house.
Karzai has vacillated between calling for an end to airstrikes and night raids and softer rebukes of NATO forces, telling them to exercise more caution. NATO has managed to significantly reduce civilian casualties from its operations in recent years.
Meanwhile, civilians deaths from insurgent attacks have spiked.
At least 2,777 civilians were killed in Afghanistan in 2010, a 15 percent increase over the prior year, according to a United Nations report. The insurgency was blamed for most of those deaths, while civilian deaths attributed to NATO troops declined 21 percent.
The fighting has also continued to take the lives of international and Afghan forces. In the latest death Tuesday, a NATO service member was killed in a bomb attack in eastern Afghanistan, according to a statement from NATO forces. The military alliance did not provide further details.
Including Tuesday's bombing, 52 NATO service members have been killed in May, including at least 28 Americans.