Natural gas futures climbed to the highest level in more than a week on Friday, before turning lower as investors cashed out of the market to lock in gains from a recent rally. On the New York Mercantile Exchange, natural gas for delivery in May hit an intraday peak of $2.693 per million British thermal units on Friday, the strongest level since April 7, before closing at $2.634, down 5.0 cents, or 1.86%.