(AGI) Rome, Sept 14 - Italian Prime Minister Matteo Renzicalled on Sunday for the international community to fight thethreat of ISIS together, following the "barbaric murder" ofBritish aid worker David Haines. "The international communitymust take a united stance against this ferocious terror. Europeis active in the front line in the fight against this hateful,insane threat," Mr Renzi told British Prime Minister DavidCameron on Sunday. . .