BJP Yuva Morcha leader Chetan Tiwari, 30, was critically injured after an attacker fired five rounds in Lucknow's Mehndiganj. CCTV shows the suspect, Vaibhav Vajpayee, opening fire near Chetan's home. The accused has been taken into custody. Chetan is undergoing treatment at the KGMU Trauma Centre. Police suspect an old rivalry linked to a dispute over hoardings as the possible motive.