Almost a month into their review of the deadly blast at a Texas fertilizer plant, investigators hope to diagram how the plant looked before the explosion.
Then, they'll take that aerial picture and compare it to the 93-foot-wide crater that's there now.
They'll paint and mark off lines for the walls of buildings at West Fertilizer, where an April explosion left at least 14 people dead. Then, they'll fly overhead to compare the lines to the crater.
They continue to reconstruct as much of the plant as they can in hopes of finding clues or evidence about a blast that registered as a small earthquake.
Officials have pushed back an initial date of May 10 for findings after determining they had more work left to do than originally thought.
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