Kolkata, May 2 -- The Election Commission of India (ECI) on Friday further intensified the security outside strongrooms after a ruckus broke out between the ruling Trinamool Congress (TMC) and the Bharatiya Janata Party (BJP) over allegations of EVM tampering and security being compromised in strongrooms, on Thursday night. Additional forces were deployed to reinforce the three-layer security system comprising state police and Central Armed Police Forces (CAPF), while iron guardrails were installed to further fortify the strongrooms, officials aware of the developments said. "Security has been further strengthened outside the strongrooms. Additional forces have been deployed. Only authorised personnel, including political candidates and their representatives were being allowed up to a certain area where screens were set up which was airing live feeds from inside the strongroom," said a senior ECI official. "There would be real-time oversight from ECI and CEO offices to trigger immediate response to any untoward incident. Any unlawful activities to be reported urgently with strict action to be taken against any involved individual. No attempt to disrupt the peace will go unpunished," the official added. The move came hours after a political row erupted on Thursday night when the TMC alleged that unidentified persons were seen inside a strongroom at Khudiram Anushilan Kendra in central Kolkata. TMC leaders staged a sit-in protest outside the facility, where EVMs from seven North Kolkata assembly constituencies and postal ballots were stored. BJP leaders also reached the spot, leading to a heated confrontation. TMC chief Mamata Banerjee also visited a strongroom at Sakhawat Memorial Government Girls' High School in south Kolkata, where EVMs of the Bhabanipur assembly constituency were kept. She remained there for nearly four hours from around 9 pm on Thursday. West Bengal Chief Electoral Officer Manoj Kumar Agarwal had dismissed the allegations at a late-night press conference on Thursday, asserting that the EVMs were safe and secure. On Friday, leaders from both parties revisited strongrooms to review security arrangements and live CCTV feeds. TMC leaders Kunal Ghosh and Shashi Panja visited Khudiram Anushilan Kendra, while BJP leader Suvendu Adhikari inspected the facility at Sakhawat Memorial school....