The West Bengal Police on Friday arrested the alleged mastermind of the gherao of seven judicial officers in Malda district from Siliguri’s Bagdogra airport, a senior officer said.The accused, identified as advocate Mofakkarul Islam, was arrested while he was trying to board a flight, he said.”He is the mastermind of the Kaliachak incident in which seven judicial officers were gheraoed inside a BDO office for several hours on Wednesday night. He was trying to board a flight to flee,” the officer said.With the latest apprehension, the police have so far arrested 33 people, including an ISF candidate, for their alleged involvement in the incident, he added.