India, Feb. 21 -- New Delhi

Nearly 20,000 personnel are expected to be deployed in Delhi for the special intensive revision (SIR) of electoral rolls exercise that will start in April, officials familiar with the matter said on Friday.

Officials with the office of Delhi's chief electoral officer (CEO) said that preparatory work had already been completed and the training of a large contingent of field staff has been completed.

"Booth-level officers (BLOs), electoral registration officers (EROs), assistant electoral registration officers (AEROs) and other support staff will form the backbone of the revision drive," an official, requesting not to be named, said.

There are more than 13,600 polling booths in Delhi and each booth will be ma...