Two British soldiers have been killed in southern Afghanistan, officials said on Thursday.

In a statement, NATO said the troops died during a "hostile incident" on Wednesday. The U.K. Defence Ministry later confirmed the two soldiers were British.

Details of how the soldiers were killed were not provided.

Southern Afghanistan is the centre of the Taliban-led insurgency. Canada has about 2,500 troops there, mostly in Kandahar province. Up to 20,000 additional U.S. troops are expected to be deployed to the region later this year.

13 die in helicopter crash

In other news, one of Afghanistan's top generals has died in a helicopter crash along with a dozen other army members, the Defence Ministry said Thursday.

The helicopter went down in the western province of Herat on Thursday because of bad weather, said Defence Ministry spokesman Gen. Mohammad Zahir Azimi.

Thirteen people died in total, including one of the Afghan army's four regional commanders, Gen. Fazaludin Sayar, who was in charge of the entire west of the country.

The helicopter was travelling from Farah province when it crashed in the Adraskan district of neighbouring Herat.

With files from the Associated Press