The activists, led by Mann, in half a dozen vehicles, were on their way to Kashmir from Amritsar and were detained at Lakhanpur of the district, police said.
The activists staged a protest at Lakhanpurwhile raising slogans to restore peace and stop atrocities in Kashmir.
"We are going to Kashmir with a message of peace and want to talk to all sections of society, government, public, hurriyat conference and otherparties as other political parties have failed to restorepeace in the state," Mann said.