The U.S. space agency NASA says it has pushed the resumption of space shuttle flights back one or two months until at least May next year.

In a statement, NASA officials said the delay was forced by the effects of four hurricanes hitting several of its flight centers.

Hurricanes Charley, Frances, Ivan and Jeanne closed down NASA's Kennedy Space Center in Florida for several days and damaged several facilities.

NASA officials added that many NASA workers and contractors are still coping with the aftermath of the hurricanes.