I think there is total confusion over this.Some reports say it was LPG, your news is of CNG.Which is correct? Times of India Mumbai said that the van was carrying LPG cylinders for home use, one of which leaked etc. There are any number of vehicles in Mumbai which are fitted with CNG kits and some LPG kits. All do function well, if they are from an authorised sourse.All taxis are running on CNG for last 15 years.No problem.Supreme Court and the NGO were correct in bringing some order in Delhi.Many rickas and taxis were using even kerosene, etc.and polluting Delhi. We have a tendency to mix up and exaggerate and create panic.