Rescuers search Texas fertilizer plant ruins

Firefighters conduct a search and rescue of an apartment building destroyed Wednesday by an explosion at a fertilizer plant in West, Texas, Thursday, April 18, 2013. The massive explosion at the plant killed as many as 15 people and injured more than 160, officials said overnight.

A person looks on as emergency workers fight a house fire after a nearby fertilizer plant exploded Wednesday, April 17, 2013, in West, Texas.

In this Instagram photo provided by Andy Bartee, a plume of smoke rises from a fertilizer plant fire in West, Texas on Wednesday, April 17, 2013.

Emergency workers assist an elderly person at a staging area at a local school stadium Wednesday, April 17, 2013, in West, Texas. An explosion Wednesday night at a fertilizer plant near Waco sent flames shooting high into the night sky, leaving the factory a smoldering ruin, causing major damage at nearby buildings and injuring numerous people.

Firefighter conduct search and rescue of an apartment destroyed by an explosion at a fertilizer plant in West, Texas, Thursday, April 18, 2013.

Firefighter conduct search and rescue of an apartment destroyed by an explosion at a fertilizer plant in West, Texas, Thursday, April 18, 2013.

Firefighter conduct search and rescue of an apartment destroyed by an explosion at a fertilizer plant in West, Texas, Thursday, April 18, 2013.

Emergency workers evacuate elderly from a damaged nursing home following an explosion at a fertilizer plant Wednesday, April 17, 2013, in West, Texas.

Rescue workers searched the smoldering ruins of a fertilizer plant Thursday for survivors of a monstrous explosion that leveled homes and businesses in every direction across the Texas prairie. As many as 15 people were feared dead and more than 160 others injured.