I find it very suspicious that even before the intermediate investigation results were known, as evidence was still being collected, first US and then UK came out with statement that according to their sources it was a bomb...
I'm sure they have some alternative agenda. Let's face it they can't just spin a regular old plane crash for anything. The UK has just pushed through some massive spy legislation that requires them to collect all internet data usage and store it for a year so they can say "look see why we need this". Don't believe anything they say.