Smoke was still rising from the collapsed car park on Friday at the Westgate mall in Nairobi, the scene of the four day siege in which at least 67 people were killed.
It is still unclear what caused the car park to collapse but in a recent Twitter feed al-Shabab claimed that a Kenyan government assault team carried out "a demolition" of the building.
The Kenyan government has rejected the claim.
A Junior Super Chef cooking competition was being held in the parking area and dozens of people - many from Kenya's community of Ismaili Muslims - were at long tables set up beneath car advertisements.
The tables were still there on Friday, in disarray; a testament to the chaos of the last few days.
Among those killed were six Britons and citizens from France, Canada, the Netherlands, Australia, Peru, India, Ghana, South Africa and China.
Al-Shabab had threatened retaliation against Kenya for sending its troops into Somalia against them, and many of those killed in the attack were Kenyans.