India, Aug. 12 -- Nearly 300 Opposition lawmakers on Monday morning marched from Parliament to the Election Commission of India (ECI) over alleged irregularities in voter rolls but were stopped and later detained by Delhi Police, prompting some parliamentarians to scale the barricades in what became a major show of strength.

The MPs, including Leader of the Opposition in the Lok Sabha Rahul Gandhi, started marching around 11.30am, but were stopped at Sansad Marg at noon,metres away from the Parliament complex amid heavy deployment of police and security personnel.

Lawmakers sat down on the road in protest, and insisted that all protesting MPs must be allowed to reach the ECI office at Ashoka Road. Samajwadi Party chief Akhilesh Yadav, T...