Swiss authorities are now investigating six people for their alleged involvement in the multi-billion dollar 1MDB scandal and two Swiss banks — Falcon Private Bank and BSI SA — remain under suspicion, Swiss Attorney General Michael Lauber told reporters Tuesday in Putrajaya, Bloomberg reports. Two officials from an energy company in Saudi Arabia and two former officials from Abu Dhabi sovereign funds are among the six individuals under investigation by the Swiss government, according to the Al-Jazeera. Meanwhile, the Walls Street Journal reported that former Goldman Sachs Group Inc. banker Tim Leissner is in talks with U.S. prosecutors to potentially plead guilty to criminal charges stemming from alleged scheme to steal billions of dollars from the Malaysian investment fund.