Sen was scheduled to visit Nepal to attend an international seminar organised by the United Nations.
The seminar 'Health Care in Conflict areas' was scheduled to take place on July 6 and 7 and he was prepared to catch a flight to the Nepalese capital on July 5 from Delhi.
Binayak Sen, who is also a physician, said, "While I was in Delhi Airport to avail a flight for Kathmandu, my advocate S K Farhan informed me that the court had denied permission to go to Nepal as it assumed that my appearance in Nepal will be harmful for the state. I did not anticipate that the permission would be denied."
Grover too was in Delhi Air Port on July 5 as both were scheduled to go to Nepal by the same flight, Sen said.
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Sen, now on his way to Kalyani from Kolkata, said he had applied for the permission to attend the seminar to Raipur Court towards the end of June, 2013.
He said," My Advocate had applied in Raipur Court for permission after completion of all formalities, but I did not anticipate to be denied."