What country are you living in? 0% chance? The sad thing is, I doubt we'll get the real story even if it is a terrorist act. It's better for the government to keep us feeling safe and working. That keeps the taxes coming and the economy working, after all. I just wish we could really "know" the truth about everything. Just because they say "minor injuries" doesn't mean it is so.
As a former Boeing Employee with a decent understanding or airline mechanics and the manufacturing process, I can personally vouch for a number of "cover ups" and "bogus" stories the government used to explain plane crashes and explosions.