Property purchase with lien help!

[John Zhao]

Hello BP group, I would like to see if anyone have an answer to this question. If a seller sold a home to buyer, and the buyer used a closing attorney and had purchased a title insurance prior to the transaction close. The property was then closed with a warranty deed issued by the seller, but the mortgage lien originally on the property was never cleared, and the original lien holder end up forclosing the property under the sellers name? who do you think is responsible and why?

1) the buyer ?

2) the seller?

3) title company?

4) closing attorney 

5) the mortgage company??