Well researched. Impressive!! The signature of Wahhabis id to blow innocents up. That’s it.
It is also the signature of other groups too.
If you have decided that you know who has done this then fair enough, if however you actually want to understand a complicated situation in a foreign country then you need to approach issues with a more open mind.
It might well be the jihadis are behind this. I certainly wouldn’t rule it out, but given that similar pipe bombs that exploded in a nearby shopping mall earlier this year have been linked to sources other than Islamists then anyone with a modicum of intelligence would realise that this attack might just be linked.
You seem to know what has happened and who is behind it, long before the police on the ground, you know the people who actually investigate crimes in that country, have come to a conclusion.
I congratulate you on your superb forensic skills.