Brazilian federal police arrested the heads of the country's two largest construction firms Friday in an investigation on corruption of state-controlled oil giant Petrobras, according to dpa. Marcelo Odebrecht, owner and president of the Odebrecht firm, and Otavio Marques de Azevedo, president of Andrade Gutierrez, were arrested at their homes in Sao Paulo. Several other executives from both firms were arrested in the police raids. -- SPA 23:31 LOCAL TIME 20:31 GMT تغريد