The by-election in NA-246, which has a become a test for contesting political parties, there the law enforcement agencies (LEAs) are also busy devising a strategy to ensure peaceful conduct of polls.
Sources told that the Sindh Rangers wrote a letter to the ECP demanding it to hold the by-election under biometric system.
The paramilitary force in its letter also demanded for the installation of CCTV cameras at all sensitive buildings in the constituency.
The by-election in the constituency is due on April 23, for which Pakistan Tehreek-i-Insaf, Muttahida Qaumi Movement and Jamaat e Islami are quite active among others.
The constituency is a traditional stronghold of MQM and it has stood victorious from there six times.