Banks are under pressure as worries over the European debt situation continue to plague the markets.Ireland is in the spotlight again amid speculation that that the cost of bailing out the nationalised bank Anglo Irish could rise to as much as €30bn (£25m).Unsurprisingly, Irish banks listed here are the worst performers, with Allied Irish and Bank of Ireland among the worst hit. RBS, HSBC and Barclays are also hurt.The aerospace and defence sector is on the attack today, even after Cobham's sales of its maintenance repair and overhaul business in France failed to impress the market.Top performing sectors so far todayAutomobiles & Parts 3,906.91 +1.77%Health Care Equipment & Services 3,215.95 +1.48%Industrial Metals & Mining 6,626.81 +1.25%Aerospace and Defence 3,278.55 +1.20%Forestry & Paper 5,579.56 +1.07%Bottom performing sectors so far todayAlternative Energy 3,425.30 -2.00%Banks 4,996.31 -1.30%Pharmaceuticals & Biotechnology 9,150.03 -1.28%Electricity 6,876.39 -1.16%Household Goods & Home Construction 6,463.11 -0.70%