should I follow up more?

I had my phone interview with the employer about 10 days ago. It was definitely not with HR, but I am not sure if he was the hiring manager or not. At the end of phone screen, I was told to expect a response within a week. I emailed the standard follow up email afterwards.

At the end one week, I received another email from HR asking for a few more questions concerning my requirements for work Visa (I am not US Citizen). I have not heard back anything since.

Should I follow up again (2nd time) with my interviewer, or did the ball pass into hands of HR now?