Police in southern Helmand province were looking into how soldiers came to fire a rocket on a house where a wedding was being celebrated late yesterday, said the deputy provincial police chief, Bacha Gull.
The rocket appeared to have been fired from an army checkpoint near the house in Sangin district as guests waited for the bride to arrive, he said.
Sangin, in the poppy-producing Helmand River valley, has been the scene of fighting between government forces and Taliban for the past six months, since US forces departed as part of the transition to Afghan sovereignty.
The international mission to rid Afghanistan of insurgents under the leadership of the United States and NATO officially ended on December 31.
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Afghanistan takes full responsibility for its own affairs from today.
In a televised address, Ghani told Afghans to support their security forces in the interests of building a strong and peaceful Afghanistan.
"If, a year ago today, you had listened to regional and international analysts, they would never have thought that today would happen," Ghani said. "They were thinking how can a country with the problems that Afghanistan has successfully complete a security and political transition.