USCIS 來信 about 485，幫忙看一下

My case is

RIR EB2, Priority Date: 06/2004

140/485 file cocurrently at 08/2006 in NSC

140 approved 04/2007

Call USCIS regarding 485 status at 05/02/2007, get letter yesterday saying:

"Based on your request we researched the status of this case. We are
actively processing this case. However, we have to perform additional review
on this case and this has caused a longer processing time. If you do not
receive a decision or other notice of action from us within 6 months of this
letter, please call customer service at the number provided below"

請問有人碰到同樣情況嗎？什麽是additional review?

所有跟帖： 

• Maybe your background check is still stuck at FBI. -NJTOO- ♂ (0 bytes) () 05/30/2007 postreply 13:56:41

• Just one of their excuse to have you wait for another 6 month -afewgoodman- ♀ (0 bytes) () 05/30/2007 postreply 14:25:00

• it means nothing. we had the same letter before -thousand- ♀ (36 bytes) () 05/30/2007 postreply 14:46:57

• 回複：it means nothing. we had the same letter before -mark0- ♂ (83 bytes) () 05/30/2007 postreply 15:05:23