Is Transit visa needed for Raykjavik while traveling to India from USA (round trip)

Is Transit visa needed for Raykjavik while traveling to India from USA. I hold Indian passport and valid USA visa. My layover in Raykjavik is for 6.30 hours 1 way and other way is 2.30 hours. Has anyone travel recently in similar situation without applying for any transit visa for Raykjavik, Iceland. I tried calling Embassy but no one answered the call and no response so far for my email sent.