The mishap occurred when the roadways bus, on its way to Ghatampur last evening, collided head on with the speeding truck, coming from Hamirpur, they said.
25 bus passengers were injured in the mishap, they said, adding five of the critically injured have been referred to Hallet hospital here.
A case has been filed against the unknown truck driver, police said, adding a man hunt is launched to nab the accused.