India, July 2 -- Meanwhile condemning the attack, NHAI chairman Santosh Kumar Yadav has written a strongly worded letter to the chief secretary Prabobh Saxena seeking "detailed enquiry into the incident and appropriate legal action against those responsible". Yadav said that the such incidents demoralise field engineers and could delay the execution of infrastructure projects. "The officers of NHAI have sustained grave injuries and were later hospitalised... In view of the above-mentioned incident, I request you to kindly conduct a detailed enquiry into the matter and all people responsible for the manhandling of NHAI officers be tried as per law..." the letter further read. "Such an event not only raises questions on the deficiencies in the law-and-order system of the state, but also hampers the morale of the officers of NHAI working at field level," the letter mentions. In solidarity with Jindal, the NHAI Engineers Association asked all officers of the highway authority to proceed on half-day leave from 2pm on Tuesday as a mark of protest....