At least four persons were killed and about 40 injured in two separate accidents involving four passenger trains amid dense fog near Kanpur within an hour early today.

DIG, Kanpur, B P Jogdand said four persons were killed and at least 40 others were injured when the Bhiwani-Gorakhpur Gorakhdham Express hit the stationary Prayagraj Express at Panki railway station in Kanpur district at around 9:00 a.m.