A number of Swiss Banks are accused of being involved in a multi-billion dollar corruption scandal at the Brazilian state-run oil giant Petrobras. A Brazilian court has released documents alleging the Swiss bank's involvement in laundering funds which, the court said, were sourced illegally. Brazil's Supreme Court minister Teori Zavascki has launched investigations into 47 politicians, including 12 senators and 22 deputies, accused of being part of a vast kickback scheme. Swiss authorities said that they are cooperating with Brazilian prosecutors on the investigation. Some of Brazil's top politicians - including current and former senators, deputies, ministers, governors and even a former president - could now face prison sentences if tried and convicted.