Watsapp fake letter shared from other site unknowingly

Respected experts I need your valuable advice of the following matter regarding watsapp share. There is a website www.rxpg.com for millions of doctors around the country. In above website there was a letter getting shared by someone and the letter summary was (director of health has requested national board of accreditation delhi to take action against some private hospital after receiving complaints from some students studying there) and when i saw this letter i shared it on doctors group on watsapp and by sharing it reached to the concerned hospital owners and then they confirmed with director of health that this letter is fake and he has not issued any such letter to NBE) and after confirmation they filed FIR againt this fake letter being circulated saying that it affects our image in society. i want to know legal consequences as i shared this fake letter unknowingly from one site to watsapp which was found to be fake later than i also posted in the same group that letter is fake dont share it to any one. Now i am thinking that can police frame charge against me or the actual person who createf this fake letter and posted it on rxpg.com is only accused as know body knew that this letter was fake and everyone shared it to help other doctors. Please through some light regarding it act and above matter. Thankyou very much