Read it for yourself and draw your own conclusion. http://www.dailymail.co.uk/news/art...t-data-suggests-plane-downed-fire-toilet.html
All of the reports I've read point to a bomb going off from the inside. There was also supposedly a graffiti threat on the plane as well.
There is evidence that the right front and side windows of the plane were blown out. I just don't see how an electrical fire could have done that.
Either way, there is certainly enough evidence here for someone to have a reasonable suspicion of terrorism.