[Lets Be Frank]

If it was terrorism, why are there no claims of responsibility by whatever group may have done it? What would be the point if nobody ever found out it was done on purpose?

It sure is suspicious that these guys were on the plane.

[WhistlingPastTheGraveyard]

If it was terrorism, why are there no claims of responsibility by whatever group may have done it?

I put together a list of unclaimed airline bombings on another thread. It's not at all unusual for them to not claim responsibility for attacks.

Unclaimed airliner bombings