militants were able to carry out that horrific terrorist plot at the westgate mall just down the road here and also dramatic new video of how one family managed to escape. >> reporter: the four-day standoff coming to an end on tuesday after kenyan forces swept through the partially collapsed mall, searching for victims presumably buried beneath the rubble and clearing each floor of attackers, five of them found dead. cnn has learned that the fire the militant set on monday was an escape attempt. the gunmen hoping to create a smoke screen, two of them drove out from the parking lot, a senior government official says they forced them back in. among the terrorists, reports of a white woman who kenyan government officials say may have been killed early on in the siege. leading to speculation that it could be samantha lewthwaite, a british mother, fugitive and suspected terrorist.