The woman being mugged in London was sayid's girlfriend I think, and Juliet said that she didn't know where the looking glass was as nobody goes down there because it is out of use but the power is still there to block all signals apart from the others sidgnal.
The two girls down there though are they prisoners ? somone said that it is Ben's girlfriend from the darhma project? and the girl is rusos daughter? makes sense to me. where do they get food from and drinking water? if it is the people i mentioned then they have been there for 17 years or so.