New Delhi, April 30 -- Trinamool Congress (TMC) candidates Kunal Ghosh and Shashi Panja staged a sit-in protest at Khudiram Anushilan Kendra on Thursday, alleging irregular activities inside the facility.

The protest was held hours after the TMC supremo and West Bengal Chief Minister Mamata Banerjee urged TMC leaders, workers and polling agents to maintain a 24-hour vigil over strongrooms housing EVMs.

The EVMs were stored in strongrooms at the centre after the second phase of polling in West Bengal was held on Wednesday.

TMC sources told news agency PTI that the CM was also heading to the centre to take stock of the situation.

TMC leaders alleged procedural lapses. They claimed that party workers stationed outside the strongroom were...