Stock markets finished more or less flat on Tuesday afternoon after a volatile session, in which investors digested policy announcements in Japan and mixed newsflow in Germany."A rather choppy morning session in Europe gave way to a rather more sedate afternoon session as US traders returned to their desks after their long weekend break," said Michael Hewson, a senior market analyst at CMC Markets.After a two-day meeting, the Bank of Japan set a 2.0% inflation target and pledged to embark on a Fed-style unlimited asset purchase programme. Meanwhile, the central bank left its benchmark rate unchanged at the prior range of zero to 0.1%. However, the promised increase in asset repurchases will not come into place until January 2014, later than at least some had hoped. This disappointment prompted a tentative start on the FTSE 100. German newsflow shakes marketsBy mid-morning though, rumours that Bundesbank President Jens Weidmann had resigned swept through the markets, sending London's benchmark index firmly into the red. This speculation was later denied by the German central bank.Meanwhile, there were reports that the German regulator Bafin had asked lenders (including Deutsche Bank) to estimate what the cost of a hypothetical break-up of their different business segments would be. CMC's Hewson said: "The nature of this morning's move can also be attributed to the multi-year lows in the VIX [a volatility index] which suggests that investors are under protected against sharp market falls, trading at its lowest levels since 2006, and pre crisis. These lows suggest some complacency amongst market participants about the likelihood of further stock market gains."Nevertheless, stocks quickly recovered after a better-than-expected reading from the German ZEW survey. The economic sentiment index (which canvasses financial market experts) increased by 24.6 points in January to 31.5 points, thereby reaching its highest level since May 2010. This beat the consensus estimate, which had forecast only a 5.1 point increase to 12.FTSE 100: Fresnillo dragged lower by fourth-quarter resultsPrecious metals miner Fresnillo was a heavy faller after fourth-quarter gold production came in 20.6% lower than 2011. This stood in stark contrast to full-year output, which totalled 473,034 ounces, up 5.4% year-on-year and above the 460,000-ounce target. Sector peer Polymetal was also lower. DIY retailer Kingfisher was boosted after Exane BNP Paribas raised its target price from 320p to 350p and kept an 'outperform' rating. Natural gas company BG Group was also higher after Bloomberg speculated that the company is vulnerable to takeover bids as a result of the 26% decline in its share price last year. Sweeteners and food ingredients group Tate & Lyle got a boost after Berenberg increased its rating on the stock to 'buy'.Beverages giant SABMiller, the company famous for Miller Lite and Foster's brands, said that trading in the third quarter was in line with expectations with revenue growth accelerating from the first six months of the year, causing shares to edge higher. Smiths Group and Shire were in demand after Credit Suisse highlighted that they would benefit as inflation expectations rise.FTSE 250: Ocado climbs into bed with RoseOcado was the high riser of the second-tier index on the news that it had bagged Sir Stuart Rose. The former Executive Chairman of retailer Marks & Spencer will become Ocado's new independent Non-Executive Director and Chairman Designate, effective from March 11th.Meanwhile, the pantomime continues at miner Bumi, pushing the beleaguered firm's shares down. First thing this morning, the company said its investigation into alleged wrong-doing at its Indonesian operation, PT Bumi Resources, in which it holds a 29% stake, had effectively been a waste of time.PT Bumi Resources is controlled by Indonesia's Bakrie family, one of the co-founders of London-listed Bumi. The firm launched the investigation after Nathaniel Rothschild, co-founder of Bumi, produced evidence of potential misuse of development funds and other assets at the firm. Residential landlord Grainger rose after creating the GRIP unit trust with APG Strategic Real Estate Pool to acquire a residential property portfolio worth £349.4m. Gold miner African Barrick Gold edged higher after completing the financing for the expansion of its Bulyanhulu process plant in Tanzania.FTSE 100 - RisersBG Group (BG.) 1,145.00p +2.28%Randgold Resources Ltd. (RRS) 6,020.00p +1.86%Petrofac Ltd. (PFC) 1,700.00p +1.80%Smiths Group (SMIN) 1,238.00p +1.73%Next (NXT) 4,031.00p +1.54%Kingfisher (KGF) 273.00p +1.52%Tate & Lyle (TATE) 812.00p +1.50%CRH (CRH) 1,285.00p +1.34%SABMiller (SAB) 3,000.00p +1.33%Associated British Foods (ABF) 1,646.00p +1.04%FTSE 100 - FallersFresnillo (FRES) 1,725.00p -2.82%Carnival (CCL) 2,563.00p -1.91%Polymetal International (POLY) 1,055.00p -1.86%Pearson (PSON) 1,181.00p -1.75%Standard Chartered (STAN) 1,637.00p -1.62%GKN (GKN) 244.50p -1.45%Prudential (PRU) 922.50p -1.13%Royal Bank of Scotland Group (RBS) 362.90p -1.09%Land Securities Group (LAND) 805.50p -0.86%ITV (ITV) 115.40p -0.86%FTSE 250 - RisersOcado Group (OCDO) 101.00p +6.26%Rightmove (RMV) 1,599.00p +2.83%Dignity (DTY) 1,122.00p +2.47%Stobart Group Ltd. (STOB) 97.20p +2.32%Grainger (GRI) 128.80p +1.98%Pace (PIC) 217.80p +1.97%QinetiQ Group (QQ.) 185.50p +1.81%Chemring Group (CHG) 286.30p +1.67%Direct Line Insurance Group (DLG) 217.70p +1.59%Soco International (SIA) 382.60p +1.59%FTSE 250 - FallersDomino Printing Sciences (DNO) 621.00p -4.31%Elementis (ELM) 212.00p -4.20%Enterprise Inns (ETI) 99.25p -3.73%Persimmon (PSN) 857.50p -3.16%Henderson Group (HGG) 154.00p -2.96%JD Sports Fashion (JD.) 738.00p -2.89%Kenmare Resources (KMR) 34.00p -2.88%Galliford Try (GFRD) 815.00p -2.86%Fidessa Group (FDSA) 1,565.00p -2.86%BTG (BTG) 330.40p -2.82%BC