Why would they deny this attack when they didn't hesitate to take credit for every other one that has happened in the last decade? Something is not adding up. Why would alshabab deny this specific attack? I believe them. The bomb was way too advanced for alshabab to be soly responsible.
Who cares? We KNOW Somalis don't do car bombs; this car bomb and suicide phenomenon was introduced into Somalia by Jihadis. Only Jihadis believe killing as many civilians as possible as end objective in of itself because of Jihad and Shahiid doctrines. They think they're going to heaven if they kill as many infidels and their sympathizers. So, it's high noon you pick sides and stop waffling.