The White House posted a photo:

President Barack Obama speaks to people aboard a bus after the Memorial Day ceremony at Abraham Lincoln National Cemetery in Elwood, Ill., was canceled because of severe weather, May 31, 2010. The President stopped to talk to people that were attending the event but were forced to return to their buses for safety reasons.
(Official White House Photo by Pete Souza)

This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.