Ganajagaran Mancha yesterday 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.