FTSE 100 flat as investors act cautiously The index of leading shares in London closed up 20.80 at 5657.44 having been in negative territory for part of the day. Sandy Jadeja, chief technical analyst, at City Index said: "Our upside expectations have been met successfully with markets now at decision levels once again. We have seen the bullish momentum continue into last week's trading session but this week may require a little caution. After reaching above resistance levels we did see the stock indices pullback to almost where they had started. This suggests that the upside may start to see some weakness for this week ahead. There is also a potential for a major trend reversal at hand. Gold prices also reached our expected upside levels but currently looks a little weak and may pullback lower before the upside trend resumes. Carnival was the largest faller across the FTSE 100, closing down 370p - or 16.46pc - at £18.78 . The company, which owned the cruise ship that capsized off Italy's west coast at the weekend warned its 2012 earnings would take a $90m (£58.7m) hit from the disaster and said it anticipated further costs to the business. Morgan Stanley analysts said the accident could have a bigger impact on the company than just the hit to annual earnings.