"That inquiry is under way, and we will take corrective measures to ensure that anybody and every person who participated in this mall incident, that may have overstepped their mandate, will be brought to book."
It will not be possible to say whether anyone is still missing at Westgate Mall until a forensic examination of the rubble is completed, he said. "That is when we will determine whether there are extra bodies or not," he said.
Ruto, who is on trial in the Netherlands, accused of masterminding violence after Kenya's disputed election in 2007, also said he was confident the claims against him would be shown to be "mere fabricated allegations."
Ruto and Kenyan President Uhuru Kenyatta, who is on trial alongside his deputy, have denied accusations that they coordinated violence among their respective ethnic groups after the disputed election.