NAIROBI, Kenya, Oct. 21 (UPI) -- Investigators of the Nairobi, Kenya, shopping mall attack say the attackers' means of exit remains a mystery and they are pursuing various theories.
The four-day incident, beginning Sept. 21 at the upscale Westgate Mall, left 72 people dead and more than 200 injured. The Islamist group al-Shabaab claimed responsibility for the massacre as retribution for Kenyan military involvement in Somalia.
Investigators examining security footage said they noted inconsistencies with government reports, which first claimed 10 to 15 terrorists were involved.
There was also no looting at the mall by Kenyan Defense Forces, National Security Chairman Asman Kamama said, asking Kenyans using social media to "desist from besmirching and maligning the name" of the Forces.
Other contradictions include claims the terrorists took hostages. The terrorists were not after a hostage crisis but were on a killing mission, Nairobi's Standard Digital News reported Monday.
The likely option, of several, for the terrorists' departure from the mall was walking out through an unsecured basement loading area and on to a street, where journalists, medical teams and the public made a perfect cover, the investigators said.
The news organization added investigators are also pursuing a theory that the terrorists may have set a number of explosives to detonate with the mall.