The elderly woman was killed on the spot and her grandson, who had tied the knot only five days ago, succumbed to his injuries at a hospital in Rourkela.
The wife of the man was being treated at the government hospital in Burla, the police said.
The gift was given to the couple by an unidentified person at the marriage reception on February 21. It exploded when they opened the packet at home, the police said.
Bolangir Chief District Medical Officer S Mishra said the elderly woman was declared "brought dead" at the Bolangir district headquarters hospital.
''A man injured in the blast also died at the Ispat General Hospital in Rourkela,'' he added.
Disclaimer: No Business Standard Journalist was involved in creation of this content
