Clean-up efforts underway in Okla.

Christine Jones is comforted by her daughter Ashley as they stand in front of Christine's home which was destroyed when a tornado ripped through Moore, Okla., May 22, 2013.

Residents have begun to sort through what is left of the about 1,200 homes damaged or destroyed Monday when the massive twister plowed through the Oklahoma City suburb. About 33,000 people were affected, according to officials.

Read more: Oklahoma tornado's $2 B damage means hard recovery in store

Lean Newbury holds up a picture of her father's home before it was destroyed by the tornado that ripped Moore, May 22, 2013.

Hayley Hawk, 11, poses for a portrait outside of a neighbor's destroyed home in Moore, May 22, 2013. Hawk was a student of Plaza Towers Elementary school but was picked-up by her parent before the school was damaged.

A makeshift shelter is set up next to a home destroyed by a massive tornado in Moore, Okla., May 22, 2013.

Sam Dallak, left, gets an autograph from Oklahoma City Thunder guard Russell Westbrook, right, in front of her damaged home in Moore, Okla., May 22, 2013.

Ben Osborne salvages items from his tornado-ravaged home in Moore, May 22, 2013.

Karyne Urquhart (R), a music teacher at Briarwood Elementary School, and her husband Paul, look at items retrieved from her classroom, May 22, 2013.

Katie Thomas sorts through debris at a friend's tornado-ravaged day care, May 21, 2013, in Moore, Okla.

A huge tornado roared through the Oklahoma City suburb Monday, flattening entire neighborhoods and destroying an elementary school with a direct blow as children and teachers huddled against winds. Seven adults and 13 children rode survived the tornado by huddling in the daycare's bathroom.

A member of the 552nd Air Control Wing at Tinker Air Force Base helps a resident salvage items after the tornado in Moore, May 22, 2013.

Standy Stewart and her pregnant daughter-in-law Robyn Rojas have their dinner at what is left of their tornado-devastated home in Moore, Okla., May 21, 2013.

Tim Jones looks at his Honda Shadow mortorcyle burried with other debris in his home after a tornado ripped through Moore, May 22, 2013.

Volunteers from Mercy Chefs distribute hot food to tornado victims and rescue workers in a devastated neighborhood of Moore, Okla., May 21, 2013.

Brittany Brown rushes to get aid after finding her grandmother's cat "Kitty" which was buried in tornado rubble for two days at the grandmother's destroyed home in Moore, May 22, 2013.

Oklahoma City Thunder's Russell Westbrook, left, and Thabo Sefolosha, right, tour the tornado damage in Moore, Okla., May 22, 2013.

Dennis Guarnear wipes his face after trying to moves his brothers's Oklahoma Sheriff's vehicle as it sits parked in the rubble of a destroyed home, May 22, 2013.

A deer head sits in a destroyed home in Moore, May 22, 2013.

An enderly man rests at his destroyed home in Moore, May 21, 2013.

Michael Phillips (L) and Bryan Green look over a war trophy which they helped a homeowner find buried in the rubble of his home after it was destroyed by a tornado that ripped through Moore, May 22, 2013.

According to the homeowner, the piece was removed from the corner of Saddam Hussein's bed during the initial invasion of Iraq.

A woman salvages items from her tornado devastated home in Moore, May 21, 2013.

Derick Brock from Mercy Chefs (R) helps a man fold a U.S. flag he found in the debris of a tornado devastated house in Moore, May 21, 2013.

Matt Johnson salvages items from his grandparents' home after a powerful tornado ripped through the neighborhood in Moore, May 21, 2013.

A tornado devastated neighborhood in Moore is pictured in the evening of May 21, 2013.

Amber Johnson (R) a fifth grade teacher at Briarwood Elementary School salvages items from her car which was parked at the school when a powerful tornado ripped through Moore, May 21, 2013.

A man salvage items from his grandmother's tornado devastated home in Moore, May 21, 2013.

Chad Brown, right, helps his father Rick sift through the wreckage of his home in a neighborhood which was destroyed Monday when a tornado moved through Moore, Okla., May 22, 2013.

Workers continue to comb through debris at the Plaza Towers Elementary School in Moore, Okla., May 21, 2013.

Brittany Brown, left, and her grandmother Tracy Harville tend to Harville's cat "Kitty" after finding the cat buried in tornado rubble for two days, May 22, 2013.

U.S. Air Force Staff Sgt. Jeremiah McDaniel, left, based at nearby Tinker Air Force Base, prepares to hand Morgan Gregg, right, a porcelain Christmas decoration he recovered from a tornado damaged home in Moore, May 22, 2013.

People take a break from searching for their belongings in Moore, Okla., May 22, 2013.