Three persons were killed and another was critically injured in the blast when members of Posco Pratirodh Sangram Samiti (PPSS) were making crude bombs, Jagatsinghpur SP Satyabrata Bhoi said today after reaching the spot.
"Police have recovered the materials used for making crude bombs from the site," Bhoi said, adding that the three bodies were sent for postmortem.
The injured was rushed to SCB Medical College Hospital in Cuttack in critical condition, police said.
However, Nachia Mandal of Gobindpur, who was injured in the blast, claimed that unidentified persons hurled two bombs at him and others when they were standing near a pond at Patana village.
While police claimed it had gathered evidence showing the explosion took place during bomb making, PPSS alleged that some miscreants hurled bombs on its activists.
PPSS president Abhay Sahu claimed that some miscreants had hurled bombs targeting him. "They hurled bomb targeting the house where I stay at Patana village," Sahu claimed.