UNB, Dhaka :Ganajagaran Manch on Friday demanded the arrest of the killers of publisher Faisal Arefin Dipan and the attackers of another publisher and two bloggers by November 20, threatening to launch a tough movement.The ultimatum was issued from a solidarity rally held at Shahbagh intersection in the afternoon.Speaking on the occasion, platform spokesperson Imran H Sarkar said they will announce a tougher programme from a mass rally to be held on November 20 if the government fails to arrest the culprits by the time.He also announced fresh programmes from the rally.Imran said they will bring out a torch procession from Shahbagh at 4pm on November 13 while a protest cultural rally around 3pm on November 13 and hold the mass rally on November 20.He said they will hold a seminar titled “Sprit of Liberation War: On what course Bangladesh is” at all public universities from December 1 to December 31.Ganajagaran Manch held the solidarity rally protesting the killing of publisher Dipan and the attack on another publisher and two bloggers.