23 such officers of the 1968 batch wrote the letter addressed to the Chief Minister yesterday wherein they have demanded a public statement from Raje over the incident.
Khan, who hailed from Haryana, along with four others including his two sons was attacked by cow vigilantes in Alwar's Behror on April 5 when he was allegedly transporting cows illegally.
Brutally thrashed by the mob, 55-year-old Khan had died during treatment at a hospital, while his associates suffered injuries.
"There has been a reprehensible attempt on the part of certain people in authority in Rajasthan as well as in the union government to deny this horrific incident, or to minimise its gravity.
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"Other authority figures have made themselves complicit this by their inaction and silence," they alleged in the open letter.
The officers who have signed the letter included activist Aruna Roy, Gopalkrishna Gandhi, Narendra Singh Sisodia and others.
The police have arrested several persons in connection with both the alleged illegal transportation of cows and the lynching of Pehlu Khan.
Notably, Rajasthan Home Minister Kataria had said it was "alright" that some people caught those who were illegally transporting animals, while maintaining that "no one has the right to take the law in their own hands".
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