The FBI and Interpol are among international agencies that have joined investigation into the 14 Riverside Drive complex terrorist attack.
Detectives from the agencies have been camping at the scene of the attack and a police installation where collected evidence is being analysed.
Officials aware of the ongoing investigation say the agencies want to collect and store crucial data on the attack and attackers.
They are interested in knowing who was in touch with the attackers before they launched the attack on January 15, killing more than 20 people and a leaving a trail of destruction.
The agencies want to trace the places the attackers visited after leaving Somalia, where they were being radicalised and those they interacted with.
“Getting the profiles of these people is very important for them and the region at large. The detectives are in the middle of the probe,” said an official.
DNA samples
Four of the gunmen were killed at the complex while one committed suicide. Police have picked DNA samples from the bodies for analysis.
The detectives believe some of the weapons used in the attack originated from Somalia.
They have so far established that the gunmen left Somalia late last year, camped in El-Wak, Mandera for more than two months while working as traditional medicine suppliers.
In Mandera they were hosted by one of the gunmen in the Nairobi's dusitD2 attack last week, and whose cousin Abdirahim Abdullahi, a law graduate from the University of Nairobi, was among those who attacked Garissa University in April 2015, killing more than 147 people, majority of them students.
From Mandera the terrorists moved to Nairobi through Moyale and later joined Ali Salim Gachunge in Ruaka.
It is believed the group was radicalised and trained in the same camp at different times in Somalia.
Evidence has shown that the suicide bomber at the complex was a Mombasa-born Al Shabaab recruit who travelled to Somalia for training that took almost five years.
Mahir Khalid Riziki, 25, was born and brought up at Majengo area in Mombasa town.
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Detectives handling the matter say they believe Riziki was fed with drugs for the period he was being radicalised in Somalia before he was released for a mission to be a suicide bomber
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