Article Photos: Oklahoma City mayor says 12,000 to 13,000 homes damaged or destroyed by May 20 tornado 152/564

Franklin Graham, right, president of Samaritan's Purse, prays with the maintenance workers from the Moore Public Schools who erected crosses at the Plaza Towers elementary school that they built in memory of the seven children who died during the Moore tornado, Friday, May 24, 2013 in Moore, Okla. One large cross and seven smaller crosses with the names of the victims are in memory of the seven students who died in the Moore tornado. (AP Photo/Sue Ogrocki) ORG XMIT: OKSO109