Four persons - three women and an infant boy were injured in the blast when miscreants hurled the bomb in a shop at PWD colony, Wokha, the police said.
Bomb disposal squad has reached Wokha from Kohima and are in investigating the details, they said, adding that it is suspected that miscreants hurled the bomb into the shop and fled from the site.
The injured are undergoing treatment in different hospitals, police said.
A low intensity blast occurred in the commercial hub of Nagaland -- Dimapur town last night.
No casualty or lost of property has been reported by the explosion, which left a hollow mark in the aluminium door of a toilet nearby, police said.