New Delhi: Delhi Police on Monday said it has taken cognisance of a viral drone video purportedly showing protesters gathered at Parliament Street and has launched an investigation into the alleged unauthorised drone operation."The authenticity of the footage and the circumstances surrounding the drone operation are being verified. For this violation of applicable laws and drone regulations, appropriate legal action will be taken," Delhi Police said in a statement.A police source said the probe was initiated after the drone footage surfaced on social media.Also read: Rahul Gandhi calls PM Modi 'most anti-youth' PM over exam paper leaksThe source added that the New Delhi district is a highly sensitive area where prior permission is mandatory for flying drones, and any violation of the prescribed rules attracts legal action.Earlier in the day, thousands of protesters assembled near Parliament Street and attempted to march towards Parliament, demanding accountability over alleged examination irregularities and the resignation of Union Education Minster Dharmendra Pradhan.Security personnel stopped the march, leading to clashes in which baton charges were carried out to disperse the crowd.