On Tuesday remains of victims were still being brought out of rubble spread over hundreds of square metres.
Investigators believe the attack on Saturday may in part have been motivated by a desire for revenge for the botched US-led operation in August.
Mogadishu bombing: parents' grief for medical student killed in blast Read more.
Following the raid, in which three children aged between six and 10 died, local tribal elders called for revenge against the Somali government and its allies.
Officials say it involved two vehicles – a Toyota Noah minivan and a much larger truck carrying around 350kg of military grade and homemade explosives.
This bomb later detonated, possibly set off by remote control or by security officials, without causing casualties, two officials told the Guardian.
• This article was amended on 18 October 2017 to clarify the context for the second expert’s view. »