(ANSA) - Rome, September 24 - Bond spreads began rising again Monday as European markets sank during the day. The difference between interest rates on Italian and German bonds crossed the 350-point mark to remain stable at 355 basis points in the afternoon. The yield on 10-year Italian bonds was 5.1%, after dipping below 5% last week. The spread between Spanish bonds and the German benchmark climbed to 422 basis points with the yield on Spanish 10-year bonds at 5.78%. Milan's FTSE MIB had sunk 1.5% by midday Monday. Madrid, London, Paris and Frankfurt opened in negative territory.