Credit Suisse Group AG (NYSE:CS) shares hit new lows today on fears the bank is facing a potential market manipulation rap after the Swiss financial watchdog said it was reviewing comments made by chairman Axel Lehmann in December. News of the probe sent shares in the beleaguered bank slumping to SFr2.53 (£2.26) this morning. In early December, the Swiss bank's boss made comments during an interview saying that outflows had stabilised and even "partially reversed". The bank's share price rose by 9% on the back of these comments.