A duo, riding a bike, reportedly had hurled the bomb near the gathering spot.
A police investigation is underway.
"The bomb exploded some five hundred meters far from PM Dueba's election campaign. We have started the investigation," District Chief Superintendent of Dang, Durga Singh told ANI over phone.
Temporary Police Personnel Binod Chaudhary along with Devi DC, Sunita Chaudhary, Nardevi Budhathoki, Bamraj Sunar, Neb Bahadur KC, Parbati KC and Himlal Rasaili have been identified as the injured ones.(ANI)