Port Authority Police Officer David Lim Remembers - He was In the North Tower when it Collapsed Posted by Admin Port Authority police officer David Lim and his K-9 Sirius were inside the World Trade Center's North Tower when it collapsed on September 11, 2001. He shared his memories recently at the 2011 conference for the National Asian Peace Officers Association in San Diego. Click here for the full story and a video interview by 10News.Click here - CNN Heroes of 9/11 AMERICA REMEMBERS Port Authority Officer David Lim and K-9 Sirius. Click here - Sirius is among dozens of Rescue Dogs honored posthumously by the American Humane Association. Story from CBS New York.