from previous--

a  black  van  stopped  before  the  building  in which  afzal  khan lived  in a  flat,, when they  tried   to  enter  the  building  they  were  stopped  by the  new  guard  who  said  the  residents  had  appointed  him for  caution to  check  all  new  comers  and  prevent  them from using  the  lift  and  the  stairs