Marcelo Odebrecht (R), the head of Latin America's largest engineering and construction company Odebrecht SA, and Otavio Marques Azevedo (L), CEO of Brazil's second largest builder Andrade Gutierrez, are escorted by federal police officers as they leave the Institute of Forensic Science in Curitiba, Brazil, June 20, 2015. REUTERS/Rodolfo Burher