The injured have been identified as 30-year-old Khagaridevi Mahato and 18-year-old Indrajit Mahato.
The explosion occurred at 10 a.m.
Train with 53 bogies carrying blast arrives in Janakpur
Commemorative events are being held at Madannagar, Balkhu, while a thought seminar is scheduled at the Madan Bhandari Memorial Foundation in Gothatar.