The NATO-led International Security Assistance Force (ISAF) on Sunday detained a U.S. service member on charge of inflicting Afghan casualties in southern Kandahar province.

"A United States service member was detained today in connection to an incident that resulted in Afghan casualties in Kandahar province," the ISAF said in a press release.

Meanwhile, Kandahar provincial governor Tooryali Weesa told a press briefing that a U.S. soldier, who walked out from a military base in Zand Abad area of Panjwayi district, opened fire on civilians in the wee hours Sunday leaving several civilians dead or injured.

However, a provincial official, who declined to be named, told Xinhua that over 10 civilians were killed or injured in the shooting incident in Panjwayi district Sunday morning.

"U.S. Forces-Afghanistan (USFOR-A), in cooperation with Afghan authorities, will investigate this incident and release additional information as appropriate," the press release said.

"This is a deeply regrettable incident and we extend our thoughts and concerns to the families involved," the ISAF said.