Birgunj, May 13:

A 24-year-old man was injured this night when an unidentified gang detonated a bomb at Maisthan in Birgunj sub-metropolis-1.

The gang detonated a socket bomb in a shop at Maisthan bazaar around 9 pm, injuring Chandra Shekhar Yadav, police said. Yadav was undergoing treatment in a hospital. Investigation into the incident was underway, police said. Nobody has owned up the explosion yet.