(adds details) * Safety concerns highlighted by worker death * Ferreira fifth worker to suffer fatal injuries during 2014 World Cup construction MANAUS, BRAZIL, Dec 14 (Reuters) - A construction worker died after falling off the roof of the Arena Amazonia in Brazil on Saturday, FIFA and the World Cup organising committee confirmed on Saturday. "FIFA and the Local Organising Committee (LOC) learnt of the death of the worker on Saturday at the Arena Amazonia site with great sadness," the statement read. More...