Fighting has erupted in the area where a group of South Korean hostages are being held by the Taleban, suggesting an operation has begun to free them.Local officials told the BBC there had been fighting between government and Taleban forces in Ghazni province south-west of the capital, Kabul.
Earlier, leaflets dropped from military helicopters had warned locals to flee.
The Taleban have killed two of the 23 held, threatening more deaths unless demands for prisoner releases are met.
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