There has also been a sharp rise in the activities of self-styled Hindu cow-protection groups that stop trucks on highways and attack anyone transporting bovine animals.
Husain Khan, Pehlu Khan's relative, told HT that the old man told him before he died in hospital that the gau rakshaks tried to tear the transport permits when told they were legally transporting the cows.
One officer, Ramesh Chand Sinsinwar, told the AFP news agency the men were transporting the animals without permission.
Earlier, Katariya, while condemning the incident, said that a case has been registered against the smugglers as well as the cow vigilantes. He, however, said that taking law in one's hand is not the right thing to do.
He assured that appropriate action would be taken against the vigilantes.
Police said the mob stopped the trucks near Behror town, pulled out the men and beat them up.
The three others who sustained the injuries have returned to Nuh and have alleged that they did not receive proper care at the Kailash Hospital in Behror in Alwar, where they were admitted. The assailants were believed to be members of right-wing groups Hindu Jagaran Manch and Bajrang Dal.
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Hard-line Hindu groups, including those linked with the ruling Bharatiya Janata Party (BJP), have called for a nationwide ban on the slaughter of cows and have been blamed for such attacks.
"We do not support such incidents".
This is an act that was introduced to prohibit animal slaughter in Rajasthan.
"We had lodged an FIR against the gau rakshaks under IPC Sections 143 (unlawful assembly), 323 (voluntarily causing hurt), 341 (wrongful restraint), 147 (destruction of property), 308 (culpable homicide) and 379 (theft). We do not support any such violence", Ahir told ANI.
Rajasthan has seen at least two serious attacks by gau rakshaks this year but Chief Minister Vasundhara Raje has remained silent on the issue.
A report in The Indian Express further reported that Khan and the others were beaten up even after they produced documents to show that they had bought the cows and were not involved in illegal cow smuggling.
Apart from the attackers, police also arrested the drivers of the vehicles on suspicion of cow-trafficking, an offence in predominantly-Hindu Rajasthan.