LONDON (Reuters) - The FTSE 100 edged lower on Tuesday, as persistent worries about a trimming of U.S. economic stimulus measures dented sentiment.

The blue-chip FTSE 100 index, which had raced to a 13-year high in late May, was down by 0.2 percent, or 13.88 points, at 6,316.61 by 0705 GMT.

Alpari analyst Craig Erlam said that investors looking to add to equity positions on expectations of reassuring comments from U.S. Federal Reserve central bank head Ben Bernanke at its meeting this week were playing a risky game.

Power company Aggreko was the top FTSE 100 faller after the company said it expected flat first-half trading profits.