H1B Administrative Processing required additional document for 221g

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Hi All,
I had interview in kolkata consulate on 4th May for My H1B. They said your visa is approved and took my passport. Two days after the interview they sent an email saying your visa is refused due to administrative processing under 221g and gave me one white slip with some supplemental questions. I have submitted the filled form on 9th May.

Now I got an email on 15th May asking following documents for my H1B not sure why these documents are required for H1B. I came to India for vacation and stamping.

Please send the following additional information in details in separate MS Word file as attachments
a) Letter of Invitation from the United States sponsor;
b) Letter of Recommendation from a United States source or from abroad;
c) Letter of support from the Financial sponsor;
d) Detailed Itinerary for B1/B2 applicants;
e) Detailed overview of your course-of-study;
f) List of references in the applicant?s country of birth or residence;
g) Letter of Acceptance;
h) CV of Faculty Research Advisor.


Please let me know if you have any idea about the above document and my situation. My employer's immigration team also not sure about this.

Thanks.