State-run agencies have bought 11.92m tonnes of wheat from farmers so far this season, down 25% on the 15.92m tonnes bought in the same period a year ago
"Afghan police killed a Daesh commander in Ghor province during an operation yesterday but Daesh fighters abducted some 30 civilians from near the provincial capital and shot them all dead in revenge," said Abdul Hai Khatibi, a spokesman for the governor, using a name commonly given to Islamic State.
The killings followed an attack by militants near Feroz Koh, the provincial capital, on Tuesday.
Ghor, in central-western Afghanistan, has not been known as a major centre for Islamic State, which has been concentrated in the eastern state of Nangarhar.