A US flag frames firefighters from Bellmead Fire Department waiting for a procession of fire trucks and emergency vehicles before a memorial service for the victims of the West, Texas fertilizer plant explosion last week, at Baylor University in Waco, Texas, April 25, 2013. [Photo/Agencies]

Portraits of twelve who died in the fertilizer plant explosion in West, Texas, are pictured alongside their coffins as US President Barack Obama delivers remarks during a memorial ceremony held at Baylor University in Waco, Texas, April 25, 2013.[Photo/Agencies]