The former US Army officer emphasized the severity of the blast, pointing to photographs showing human remains a considerable distance from the site as proof of the explosion's immense power.
He commended the security guard for intervening and preventing the suspected bomber from entering the restaurant, potentially averting further harm to innocent people.
Russian officials have not disclosed the woman's motivations, leaving it unclear whether she acted knowingly or was manipulated by others.
The Russian Investigative Committee has initiated a criminal investigation into the bombing, but has yet to publicly name the woman, identify a suspected organizer, or make any arrests.
