A day after a massive fertilizer-plant explosion ripped through West, Texas, officials are still searching for survivors and answers. The exact number of casualties is still unknown, as officials are refusing to estimate a death toll. It's been rumored that as many as 40 people were killed in the blast, with the mayor of West saying earlier Thursday the blast killed at least 14. More than 160 are reportedly injured. Search crews continue to pick through the rubble in hopes of finding survivors. Waco doctors say they are treating mostly blast injuries, not chemical ones, but police warned the situation is still volatile due to the lingering ammonium nitrate.