KANPUR, May 25 -- A violent case of road rage on Sunday night left a father and son dead and another son critically injured after a minor motorcycle collision escalated into a knife attack in Kanpur's Naubasta area, police said.

Shivnarayan Trivedi, 60, and his son Shivam, 28, were declared dead on arrival at LLR Hospital while Trivedi's second son Satyam, 30, remains critical. The family, residents of Rampur Kanshiram colony in Sajari, Chakeri, worked at an establishment 'Kanak Marbles' and were riding home after finishing their shift when the incident occurred in front of the Vrindavan guest house on the bypass after their motorcycle brushed against another bike.

A heated argument rapidly turned physical as the three attackers began k...