Cylinder explosion during unloading - 2 deaths, 1 injured

The incident of LPG cylinder explosion while transported with oxygen cylinders, root cause analysis, measures to be taken and a PDF file containing some photos are available at the link below.
http://www.citehr.com/360198-cylinder-explosion.html
(The content is reproduced as the author permitted sharing this information without restrictions when some other interested reader enquired in the forum in which this article appeared. Thanks to the author.)

INCIDENT :

Two fatalities & one serious injury occurred in one of the major steel plant, while unloading of gas cylinders from the truck as seen in the photographs.

Brief Description :
During unloading the Oxygen cylinders from a truck which is loaded with 95 Oxygen & 5 LPG cylinders, the oxygen cylinder hit the neck ring of LPG cylinder which gave way its welding causing LPG leak followed by explosion & fire.Further the valve of the oxygen cylinder too got damaged & leaked causing explosion & the cylinder flown like a rocket. Two persons who were engaged for unloading were died & one person met with serious injuries.

Probable Causes :

1) The oxygen cylinders were stored in horizontal position & without protective caps.
2) LPG cylinders were kept along with oxygen cylinders.
3) Smoking in the area.

Lessons to be Learnt :
1) Gas cylinders need to be transported in vertical position
2) No gas cylinder is to be transported / handled without its protective cap. No cylinders should be received in our premises without having its cap.
3) Oxygen cylinder should not be transported along with cylinders containing flammable gas like LPG, Acetylene etc.
4) No smoking need to be strictly followed during transportation / handling the gas cylinders.
5) Gas cylinders need to be unloaded using standard method & not by throwing them.

Pl review the existing practices and takes appropriate actions. Please communicate to all, own / contractor employees about this incident.