WEST, Texas (AP) — As word spread of a spiraling fire at this Texas town's fertilizer plant, volunteers raced to protect families and elderly residents who lived nearby. Stores of ammonium nitrate exploded in a gigantic blast that registered as a small earthquake and sprayed debris miles away. Fifteen people were killed, including 12 volunteer firefighters and others responding to the fire, and more than 200 were injured. Residents of West, which is recovering but has a long way to go, will mark the one-year anniversary of the blast Thursday with a moment of silence at 7:51 p.m., the exact time of the leveling blast at West Fertilizer Co.