Austin - Officials have determined that ammonium nitrate
stored at a Texas fertiliser plant is what exploded on 17 April, killing 14
people and injuring hundreds.
The finding was expected, and officials had said they
were focusing their investigation on the explosive chemical used in many
But State Fire Marshal's Office spokesperson Rachel
Moreno says it's still undetermined what set off the ammonium nitrate.
She said findings on what caused the blast on the
outskirts of the small town of West will be delayed.
They had been expected on Friday.
Moreno said a spot that is now a 27m-wide crater was
where the ammonium nitrate was stored.
Federal emergency officials have begun offering shelter
for West residents, whose homes were destroyed or severely damaged.
About 70 homes were damaged or destroyed.