"One of the accused identified as Ramkumar was arrested today while others are absconding and being searched," SP Nagaur Raghvendra Suhasa said.
Four persons -three from Dalit community and one from Jat community-- were killed on Thursday in a land-related old dispute in Dangawas village of Merta city town.
The supporters of Kanaram Jat and Ratna Ram Meghwal armed with sharp edged weapons and guns clashed with each other, SHO Merta City Nagaram said.
While Rampal died of a bullet shot, three others-Ratna Ram, Pokar Ram and Pancha Ram received injuries by other weapons and died, he said.
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He said that the murder provoked the Jat community which resulted in the group clash that left two others dead on the spot and eight injured.
One of the injured later succumbed to the injuries in a hospital in Ajmer.
The disputed land was in the possession of Ratna Ram Meghwal, one of the slain men, while members of Jat community also stake claim on the land, the SHO said.
Meanwhile, Home Minister of Rajasthan Gulab Chand Kataria said that the police have no magical want to arrest the accused.
"We do not have a magical want," Kataria told reporters in Udaipur when asked about the development in the case.
On the other hand, People's Union for Civil Liberties demanded a CBI inquiry in the case saying it was a case of atrocities against Dalits.
"The village panchayat wanted to grab the land of Dalits. The Dalit women were also targeted and we demand from the police to add section of rape," a PUCL statement said here.