Bank Fixed Deposits : What happens to accounts of a NRI's NRE or FCNR accounts which he/she has opened abroad after his/her return to India?

Bank Fixed Deposits :
What happens to accounts of a NRI's NRE or FCNR accounts which he/she has opened abroad after his/her return to India?
A returning Indian's NRE/FCNR accounts is usually designated as a Resident account. Most banks allow these deposits to continue to run till maturity at the contracted rate of interest.