The headline says BinLaden associates may have been behind train blasts as if it were a press release by the police (semantically, it is quite correct, but I dont think wild speculation should be put up as a headline). The author, right at the end, puts one line saying LEJ did somehting, so he thinks they may have been involved. People will do anything for eyeballs, won't they? Lets all cook up fanciful stories and put it up as a statement with a slight disclaimer "may". There may be green flying creatures on the planet nebunon-Z5. Kryptonite may cure cancer and aids at the same go. Heroin may be used to treat an Ebola outbreak.
Seriously, if Bin Laden was involved, why would he use a petrol bomb when he can afford to use some seriously damaging explosives? How likely is that?