Dhaka, Oct. 12 -- Delhi has ramped up security measures and closed six Metro stations as India's opposition parties prepare to march towards the Supreme Court, stepping up their campaign against alleged electoral-roll irregularities after a weekend of mass detentions.

The Congress-led opposition has called the demonstration to demand a halt to the Special Intensive Revision (SIR) of electoral rolls and the resignation of Chief Election Commissioner Gyanesh Kumar, local media report.

Congress leader Rahul Gandhi has urged opposition parties, students and civil society groups to join the march, which is scheduled to begin at 1:30pm on Monday from the Connaught Place-Barakhamba Road junction towards the Supreme Court.

Authorities have ere...