A spokesman of the separatist outfit said, "Yasin Malik and 12 other JKLF leaders and activists were detained by police at Sangam (in Anantnag district) and lodged at Awantipora police station."
He said the JKLF leaders were on their way to Doda region to distribute relief material among the earthquake affected people.
The spokesman condemned the police action.
Last month, Malik and his supporters were reportedly pushed back from Doda when they had taken three truckloads of relief material for distribution in the quake-hit areas.
The moderate Hurriyat Conference leaders had planned to sit on dharna to protest what they termed as "government atrocities" against the people of Kashmir, the sources said.