(CBS/AP) KABUL, Afghanistan - Afghan officials say a mine laid in a road has killed eight civilians in the country's south, including women and children.
The governor's office in Helmand province says the eight were driving Monday in Musa Qala district when their car hit the explosives.
The United Nations says 579 civilians were killed in the first four months of this year. Militants are responsible for most of these casualties. In the first four months of this year, anti-government forces caused 79 percent of all civilian casualties and Afghan and foreign forces 9 percent. It was not clear who was responsible for the remaining 12 percent.
The blast comes a day after the latest likely case of an insider attack. Anand several others injured Monday when individuals dressed in Afghan police uniforms turned their guns on them in southern Afghanistan, U.S. officials said.
Jamie Graybeal, a spokesman for the International Security Assistance Force in Afghanistan, confirmed the death and said that the three Afghan shooters fled and are being sought. Although they were wearing police uniforms, it was not yet certain if they were actually Afghan police or were just wearing the clothing.
Other U.S. officials said that nine U.S. troops were injured in the shooting, mostly with fairly minor wounds. The officials spoke on condition of anonymity to discuss an investigation.
Neither Graybeal nor other officials would say which branch of the service the U.S. troops were from or provide details on the location of the shooting.
The number of insider attacks in Afghanistan has escalated, with more than a dozen fatal assaults already this year, that have led to more than 20 deaths.
Last year there were a total of 21 fatal attacks that killed 35 coalition service members, according to ISAF figures. That compares with 11 fatal attacks and 20 deaths the previous year. In 2007 and 2008 there were a combined total of four attacks and four deaths.
Officials have not routinely reported the attacks when troops were wounded until a recent Associated Press story detailed the omission. They don't usually disclose the number of service members who are wounded in the fatal attacks.
The attacks spiked after a series of mistakes and other behavior problems by U.S. troops serving in Afghanistan, including the accidental burning of Qurans and other religious materials earlier this year.
Efforts to drawdown the number of U.S. troops in Afghanistan currently at 88,000 rely on the Americans working closely with their Afghan partners to train and mentor them so that they can take over the security of their country. But such insider attacks fuel distrust between the troops and have triggered increased security protections for the U.S. service members serving in Afghanistan.
In other violence around the country, a senior police official in Kandahar province tells CBS News that seven militants armed with small arms, rocket propelled grenades and some wearing suicide vests attacked a U.S. outpost in the Shahwali Kot district.
He said the attack was repelled after an hour-long gun battle and all the attackers were killed outside the parameter of the base. He added that one civilian contractor was killed and a number of soldiers were injured in the attack. The nationalities of the injured soldiers and the slain contractor were not immediately clear. U.S. troops are usually stationed alongside Afghan counterparts at such bases.