The incident took place when six persons were going back to their home in Rajiv Vihar area after watching a mela, following which the speeding truck hit their horse-carriage, they said.
Neena (17), Puttu (9), Laddu (5) and Nitin (30) died on the spot, while Sanjana (10) and Babita (27) were admitted to Hallet hospital, police said.
Sanjana succumbed during her treatment at the hospital, they said.