Rahmat Gul, AP
Afghan President Ashraf Ghani, center, and former President of Afghanistan Hamid Karzai, right, attend a ceremony marking the completion of security transition to Afghan security forces in Kabul, Afghanistan, Thursday, Jan. 1, 2015. Afghan police are investigating a rocket strike on a wedding party that killed at least 28 people, many of them women and children, an official said Thursday, as President Ashraf Ghani marked the country’s transition to full sovereignty after the 13-year international military mission to rid Afghanistan of insurgents officially ended. (AP Photo/Rahmat Gul)

KANDAHAR, Afghanistan — The Afghan government has sent a team to southern Helmand province to investigate the deaths of at least 28 people, mostly women and children, killed when soldiers fired artillery at a wedding party, officials said Friday.

Gen. Dawlat Waziri, deputy Defense Ministry spokesman, said the investigation team from Kabul traveled to the volatile Sangin district after an initial probe found soldiers had fired at a house from two directions while the wedding party was in full swing on Wednesday night.

Officials in the province earlier said that the artillery fire wounded at least 51 people at the house in the Sarwankhala area of Sangin, where government forces and Taliban insurgents have fought skirmishes for the last six months since U.S. forces withdrew.

The head of the army in Helmand, Gen. Sultan Mahmoud, said all soldiers in the area at the time had been confined to their base until the investigation concludes.

He said that no arrests had been made.

The incident happened just hours before Afghanistan's own forces took control Thursday of nationwide security after the end of the 13-year international combat mission led by the United States and NATO.

Fighting continues across the country, however, as Taliban insurgents test the capacity of the Afghan forces, trained mainly by the U.S. military but now operating largely without their help.

In Lashkar Gah, the capital of Helmand, three employees of the private Azizi Bank and a policeman where killed when a roadside bomb exploded beneath a bank vehicle, said Omar Zwak, the spokesman for the provincial governor.