Images of the bloodied bodies of five attackers were broadcast across social media as Kenyatta announced the end of the siege, which echoed a 2013 Al-Shabaab assault that killed 67 people at the Westgate shopping centre in the same district. Two were taxi drivers and one was a mobile phone financial services agent, court documents said. Prosecutors said they were pursuing more suspects in and outside Kenya.
Director of public prosecutions Noordin Haji says the investigations are complex and transnational and require sufficient time to uncover the entire "criminal syndicate".
Gladys Kaari Justus is being investigated over transferring money, while Guleid Abdihakim - who holds Canadian citizenship - is being probed over suspicious communication.
Global Affairs Canada issued a statement on Abdihakim's arrest claiming they are "aware of reports that a Canadian citizen has been arrested in Kenya".
Police earlier identified a Kenyan military officer as the father of a suspect in the assault.
Officials say the attackers were in constant communication with several phone numbers which are located in Somalia.
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A total of 11 suspects were arrested after Tuesday's attack, however investigations into the others were still ongoing. Shop owners temporarily closed businesses to protest against extremism, and crowds gathered. While U.S. airstrikes and a multinational African Union force in Somalia have reduced the Islamic extremists' ability to operate, al-Shabab is still capable of carrying out spectacular acts of violence in retaliation for the Kenyan military's presence in Somalia.
The attack on an up-market hotel complex in Kenya's capital that claimed at least 21 lives has shocked tourist stakeholders across East Africa who are concerned about the potential future impacts to foreign visitors planning to visit Kenya and its neighbouring states.
"The detectives are looking for a woman suspected to have ferried weapons from Kiunga through the port city of Mombasa to Nairobi", a police official who did not wish to be named said, referring to a region near the Somali border.
A police official and a private security professional who took part in rescue efforts at the complex said a man who blew himself up outside a restaurant was also believed to be a non-Somali.
In the television interview, Ogelo said God saved him and gave him a "second chance".