20 children among at least 51 killed by vast Oklahoma tornado

(CNN) -- At least 51 people -- including at least 20 children -- were killed when a massive tornado struck an area outside Oklahoma City on Monday afternoon, officials said. Seven of those children were killed at Plaza Towers Elementary School in MooreStudents were clinging to the walls when the tornado hit.Although Oklahoma is a state where tornadoes are a fact of life, few days stand out like May 3, 1999. That was when some 70 tornadoes touched down over a 21-hour period, cutting paths of destruction like deep cuts of a knife blade in and aroundAfter a devastating tornado hit Oklahoma, celebs took to Twitter to share their prayers and support for the victims of the horrible tragedy.The devastating tornado that swept through Oklahoma turned houses into matchsticks and sent parents and teachers running to pull children from the wreckage of an elementary school in the eye of the storm.

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