WEST, Texas -- It has been five years since an explosion at a fertilizer plant in West, Texas, that killed 15 people and left more than 150 hurt.

• Fire left a 93-foot crater
• Destroyed 500 homes
• Registered as a small earthquake

Investigators say the fire that sparked the 2013 explosion was set intentionally.

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However, no suspects or arrests have been made. The explosion was so intense it registered as a small earthquake and left a 93-foot crater. The fire burned a 37-square-block area and destroyed more than 500 homes.