The protesters were demanding release of water from Hathini Kund barrage reservoir in Haryana into the "dying" Yamuna.
They had started their march from Kosi Kalan, a town in Mathura on March 15 and reached Faridabad border yesterday morning and blocked the roads going toward Delhi.
They entered Delhi this afternoon and blocked Mathura road. Traffic snarls were seen at Ashram, Ring Road, New Friends Colony and Ring Road. As they entered Central Delhi by evening via Mandi House, Barakhamba Road, Tolstoy Road to reach Jantar Mantar, vehicular movement was crippled in these areas as well, police said.
