"The continuous detention of youth and political leaders in Srinagar and other parts of the Valley is atrocious and undemocratic. We demand their immediate release," Jammu and Kashmir party secretary M Y Tarigami said in a statement here.
Police detained over 500 youth and separatist leaders during Lok Sabha polls in Kashmir which ended on May 7.
Tarigami said the authorities should adopt more humane approach while tackling the angry and misguided youth.
"I also appeal to the youth to follow peaceful means to express their concern for justice and democratic rights," he added.