Polling was sluggish in Rampur Sadar with the Assembly segment, earlier held by Samajwadi Party leader Azam Khan, registering around 31.22% turnout in the by-election till 5 p.m. on Monday.
Mainpuri parliamentary constituency, which fell vacant after the death of Samajwadi party patriarch Mulayam Singh Yadav, registered 51.89% voting. Khatauli Assembly segment in Muzaffarnagar recorded 54.50% polling.
The BJP and Samajwadi Party, the two main contenders, have accused each other of disrupting the electoral process. Delegations of both parties met Chief Electoral Officer Ajay Kumar Shukla alleging rigging.