I received my NOA2 from USCIS on October 15 and my K1 petition was sent to NVC. I emailed NVC a week ago and received an email reply today saying that "we have returned immigrant visa petition: (Case Number) to USCIS. If you have anymore question please contact USCIS". It appears that we have a case number but the petition is being sent back to USCIS. My fiance and I have never married, no criminal record. Anyone know what could be the reason the petition was sent back? We haven't even scheduled our interview yet. I called USCIS and NVC but they did not give me any useful information. Anyone know what is going on? I am worried.