Five members of the NATO-led forces in Afghanistan died in a helicopter crash in southern Afghanistan Monday, the coalition said.
Americans were all the fatalities in the incident, which occurred in Daman district of Kandahar province, U.S. officials told news agencies.
"Initial reporting indicates there was no enemy activity in the area at the time of the incident," the International Security Assistance Force said in a statement.
In central eastern Afghanistan, meanwhile, two U.S. soldiers died Monday when an individual wearing an Afghan National Security Forces uniform attacked U.S. and Afghan forces, ISAF said.
Three policemen and two Afghan army officers also died in the shooting at a remote military base in Wardak province, Reuters reported.
Another 10 U.S. soldiers were wounded, the BBC reported, citing the U.S. military. The killer was shot dead at the scene, the report added.
NATO-led missions in Afghanistan were suspended for almost two weeks in September last year due a rise in the so-called “green-on-blue” attacks.
“Green-on-blue," referring to a color coding system used by the military, in which blue refers to the friendly force and green refers to allied forces, is used to indicate insider killings of U.S. and NATO troops in Afghanistan.
The flashpoint Wardak province has been a rise in the tension between the Afghan authorities and the U.S. troops.
In late February, Afghan President Hamid Karzai ordered U.S. special forces to leave the province by the middle of March following allegations that “armed individuals named as U.S. special force[s] stationed in Wardak province engage in harassing, annoying, torturing and even murdering innocent people,” according to a statement by his office.
On Sunday, Karzai accused Washington of colluding with the Taliban to justify its presence in the country.
The White House strongly rejected the allegations, which were made during a visit by new Defense Secretary Chuck Hagel.
"It is their slogan for 2014, scaring us that if the U.S. is not here our people will be eliminated," Karzai was quoted as saying by AFP. The ISAF troops are to begin a long withdrawal after more than a decade of war.
In the past the Taliban have termed Karzai as a U.S. “puppet” and the Afghan government as a “puppet government.”
Karzai has been adamant that his government must be involved in any U.S.-Taliban contacts, although the Islamist militant group had earlier insisted on face-to-face talks with the U.S. rather than with the Afghan government as the Taliban leaders do not recognize Karzai administration as legitimate.
In February last year, Karzai had said that “there have been contacts between the U.S. government and the Taliban, there have been contacts between the Afghan government and the Taliban, and there have been some contacts that we have made, all of us together, including the Taliban.”
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