Help on Administrative Closure kkwuu2005-09-15 01:10:29

Hi, All
My I-485 was administratively closed recently. I submitted my I-485 in Jun after the approval of I-140 and gave my FT in Jul. But I did not get any LUDs after FP.
Just now I was told that my case was administratively closed. Anybody here knows what is administrative closure and what are the possible reasons for this kind of closure?
Thanks a lot!