two law enforcement sources tell cnn that analysts are trying to verify the terror groups claims. >> we've been waiting for this all morning, actually, expecting him to talk to his nation today about this deadly mall attack. >> while security forces say they are doing their final sweep of the site, troops are also dealing with a partial roof collapse there. >> yeah. let's find out what's happening right now. our zain verjee is in nairobi, a place she used to call home. her family still lives there. zain, we've been hearing it all wrap up for a couple of days now. what signs are there really that this could be coming to an end? >> reporter: well, it ain't over till it's over, right? sources here have been saying for a while now that they are in full control of westgate mall. then they said, well, we've got to do some sweeps still. we've got to clear it. what we saw today, they said they were defusing explosives.