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Lightning from a thunderstorm strikes amid the wreckage of twisted cars and structures at Plaza Elementary School, where seven children were killed earlier in the week when a tornado hit Moore, Okla., Thursday, May 23, 2013. The huge tornado roared through the Oklahoma City suburb Monday, flattening entire neighborhoods and destroying the elementary school with a direct blow as children and teachers huddled against winds up to 200 mph. (AP Photo/Brennan Linsley)

Brennan Linsley/AP

Lightning from a thunderstorm strikes on Thursday amid the wreckage of twisted cars and structures at Plaza Elementary School, where seven children were killed when a tornado hit Moore, Oklahoma. The tornado tore through the town on Monday, flattening neighbourhoods and destroying the elementary school with a direct blow as children and teachers huddled against winds of up to 200 mph.