In Goa, four persons from a right-wing group have been detained yesterday in connection with theexplosion in Margao town. Two members of the outfit were killed in the blast on Friday. They are allegedly linked to 2008 Malegaon blast accused sadhvi Pragya Singh Thakur. Police said the investigations so far showed IED was used in the blast and the two activists of Sanatan Sanstha who perished in the incident probably wantedto target the crowded Diwali-eve market. He said charges of waging war against the state have been pressed against the deceased Melgunda Patil and Yogesh Naik, who were activists of the Sanstha, under the Unlawful Activities (Prevention) Act, 2008. Home Minister Ravi Naik said the explosives may have got triggered before being planted at a designated spot. He said they wanted to disturb a traditional Diwali-eve event 'Narakasur' effigy competition in the heart of the town as the blast took place only a few metres away from the competition venue.