A NATO rescue team dropped by helicopter in the remote mountains of northern Afghanistan early on Saturday freed four aid workers, including two foreigners, who had been seized by the Taliban last month, the alliance said.
The aid workers, employed by Swiss-based Medair, were en route to flood-stricken parts of Badakhshan province when they were kidnapped.
NATO forces entered the area under cover of darkness and after confirming the presence of the hostages, carried out a successful raid to free them, Lieutenant Commander Brian Badura, a spokesman for the NATO-led International Security Assistance Force (ISAF) told Reuters.
The rescue team suffered no casualties in the operation, Badura said. The kidnappers were armed with heavy machine guns, AK-47 assault rifles, and rocket-propelled grenades.
The two foreigners were identified as Helen Johnston, a Briton, and Moragwa Oirere from Kenya.
British Prime Minister David Cameron, welcoming the freeing of the hostages, said their lives were increasingly in danger.
"The risks to Helen and her colleagues were getting worse all time as more and more Taliban were getting involved and the risks to her life were indeed getting greater."
He said it was an operation in which British troops were involved, and that a number of Taliban and hostage takers were killed.
"We are delighted and hugely relieved by the wonderful news that Helen and all her colleagues have been freed," her family said in a statement.
Afghan authorities originally said five people had been kidnapped, but it later emerged that one of the party managed to escape from the hostage takers.
Shamsul Rahman Shams, the deputy governor of Badakhshan, said five men who were holding the aid workers were killed in the operation.
Criminal gangs
The kidnapping of foreigners has become relatively common in parts of Afghanistan since US-backed Afghan forces toppled the Taliban government in 2001, heralding an 11-year anti-insurgent war.
In 2010, 10 foreign medical workers, including six Americans, were killed in Badakhshan in an attack blamed on insurgents.
Other attacks have been blamed on criminal groups looking for ransom. Police in Badakhshan earlier said the kidnappers in this case were demanding money, and they appeared to be members of a criminal gang.
A statement from ISAF, however, identified the hostage-takers as members of the Taliban, who have stepped up violence across the country as foreign combat forces prepare to leave by the end of 2014.
"This morning's mission, conducted by coalition forces, exemplifies our collective and unwavering commitment to defeat the Taliban," General John Allen, commander of NATO forces in Afghanistan said.
Medair is a humanitarian non-governmental organization based near Lausanne, Switzerland.
The aid workers had been traveling by donkey to visit a clinic in the remote Yawan district, where the road had been destroyed by floods caused by melting snow after one of the worst Afghan winters in decades.
Afghan forces have taken over security in the provincial capital Faizabad and some parts of Badakhshan ahead of the Western drawdown.
