Three American soldiers were killed in Afghanistan on Sunday as the result of an indirect fire incident, a Department of Defense official told Fox News.
The deaths bring to 103 the number of foreign troops killed so far this year. Of those, 81 are from the United States.
Foreign combat troops are due to leave Afghanistan at the end of 2014.
In other violence Saturday and Sunday, authorities said four explosions in the Charcheno district of southern Uruzgan province killed seven civilians.
Uruzgan provincial police chief spokesman Fared Ayel said a father and two of his children were killed Sunday when the motorcycle they were on hit a roadside bomb. He said that another three bombs in the same district on Saturday killed four people and wounded three.
Violence has been increasing around Afghanistan, especially in the east and south, as insurgents try to take advantage of the withdrawal of foreign troops to regain lost territory.
The Associated Press contributed to this report.
