Texas Fertilizer Plant Blast Ruled 'Criminal Act'

The blast killed 15 people and injured more than 260 in 2013.
1:57 | 05/11/16

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Transcript for Texas Fertilizer Plant Blast Ruled 'Criminal Act'
On April 17 when he thirteen at approximately 7:29 PM. If Irish reporter the west fertilizer facility. In west common Texas. Approximately 22 minutes later. A large explosion occurred. In addition to fifteen deaths. Twelve of whom were first responders. Many others were injured. The explosion caused damage in a 37 square block area and destroyed over 500 homes. So or other homes were also damaged. In the end a crater. 93 feet wide. And twelve feet deep was created at the C that the blast. Items of evidence were recovered. As far away as two and a half miles. This is one of ATF's largest fire investigations. In terms of not only the money spent. But also the scope. As well as well as the man hours bets on the investigation. We're here today to announce a final ruling as to the cause of the fire. The fire has been ruled as incendiary. This means this fire was a criminal act. We have come to this conclusion through over 400 interviews. A systematic fire scene examination. Considering witness observations. Viewing both witness photographs and video. As well as extensive scientific test dean at the ATF fire research laboratory. Located in Maryland. All reasonable accidental and natural fire scenarios. Were hypothesize. Consider. Tested and eliminated as being fire causes. The only hypothesis that could not be eliminated. And was concerned that and I'm sorry and was confirmed by extensive testing a TH a fire research laboratory. Is incendiary.

This transcript has been automatically generated and may not be 100% accurate.

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