This is after detectives discovered a huge underground tunnel, also used as sewerage tunnel, which runs several metres from the Westgate Mall to the neighboring Nakummatt Ukay Mall.
Mtandao huo umedai kuwa baadhi ya magaidi walitoroka kupitia njia ya maji taka iliyoko chini ya jengo la Westgate inayoenda kutokea katika mto Nairobi.