A video has emerged showing four of the gunmen involved in the massacre at a shopping centre in Nairobi, Kenya.
The footage shows four heavily-armed attackers walking through a storeroom in the mall, and searching other adjacent rooms.
It is understood that the CCTV pictures captured the gunmen mid-way through the assault - as many of the victims remained trapped inside Westgate Mall.
The video has surfaced after a government official revealed that security cameras showed there may have been fewer gunmen than originally thought.
Kenya's government initially said 10 to 15 attackers were involved in the assault, which left at least 67 people dead.
However, the official now believes only four people took part in the protracted siege.
Dozens of youths have been detained in the Majengo slum area of Nairobi in recent days in police efforts to track down the mall attackers.
Al Shabaab has said it carried out the attack in retaliation for Kenya sending troops into Somalia nearly two years ago.
The group has promised more attacks inside Kenya unless those troops are withdrawn.
Kenyan President Uhuru Kenyatta has vowed to continue the military mission inside Somalia despite the mall attack.
Mr Kenyatta ordered a commission of inquiry into the attack. The Red Cross says a further 39 people are still unaccounted for.
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