Mortgage closing fees are in the hot seat. Here's why the feds are looking into them.

The Consumer Federal Protection Bureau last week launched an inquiry into what the agency is calling "junk fees in mortgage closing costs." These additional fees, involving home appraisal, title insurance and other services, have spiked in recent years and can add thousands of dollars to the final cost of buying a home. 

Here's a deeper dive into the additional mortgage fees buyers pay before getting the keys to their new home and why five types of charges in particular are currently being looked at by the CFPB.