Mining stock Petropavlovsk plunged after Citi downgraded the stock and cut its forecasts for gold. Other miners, including Bumi, Centamin, Ferrexpo, Hochschild and African Barrick Gold were also falling sharply. High Street bookie Ladbrokes also fell after it said it has said that it had experienced softer-than-expected trading in the first quarter due to a number of one-off factors. As such, the company said that - coupled with its revised 2013 outlook for its Digital business following a deal with Playtech in March - group operating profits for the year will be at the bottom of the existing market range. Meanwhile, Betfair was the strongest riser on the second tier index following an announcement by CVC Capital Partners, in which it said it is considering making an offer for the group. Dixons Retail got a lift after Panmure Gordon upped its target price from 32p to 45p and retained a buy recommendation. Man Group rose after both UBS and Citigroup shifted their target prices on the stock to 110p, from 105p and 95p, respectively. FTSE 250 - RisersBetfair Group (BET) 772.00p +10.36%Dixons Retail (DXNS) 35.83p +3.61%Man Group (EMG) 106.10p +1.63%Interserve (IRV) 488.90p +1.62%CSR (CSR) 504.00p +1.43%Hikma Pharmaceuticals (HIK) 1,005.00p +1.21%Perform Group (PER) 495.20p +1.16%3i Group (III) 324.20p +0.93%COLT Group SA (COLT) 125.60p +0.72%Persimmon (PSN) 1,131.00p +0.71%FTSE 250 - FallersPetropavlovsk (POG) 141.10p -24.38%Bumi (BUMI) 255.70p -13.03%Centamin (DI) (CEY) 38.80p -9.77%African Barrick Gold (ABG) 172.50p -9.11%Ladbrokes (LAD) 189.70p -8.31%Hochschild Mining (HOC) 242.80p -7.65%Ferrexpo (FXPO) 168.00p -7.59%Kazakhmys (KAZ) 346.20p -7.58%Lonmin (LMI) 259.40p -6.82%New World Resources A Shares (NWR) 201.00p -5.99%NR