A New York Times infographic shows the extent of the damage from the West, Tex., fertilizer plant explosion. On Friday authorities announced that an EMT who was at the scene of the explosion had been arrested for possession of a destructive device. Authorities also announced they had started a criminal investigation into the blast. They did not say whether the arrest and the criminal investigation were related, making for another busy day of speculation on cable newscasts. Map links to New Times infographic.