Police said the IED exploded at the jewellery shop named Bikash Traders around 1 pm. Shop operator Bikash Sarada, his brother Rahul, and employees Asmita Chaudhary and Binita Chaudhary were injured in the blast.
Customers Dev Kumari Yadav of Nawarajpur Rural Municipality-3 and her seven-year-old son Satish, Babita Yadav of Saptari Surunga Municipality-21 and her younger sister Binita Yadav were injured in the incident.
The Area Police Office said the injured were rushed to the Lahan-based Saptarishi Hospital. Doctors said injured Dev Kumari Yadav, Babita Yadav and Binita Yadav complained of hearing loss.
Seven-year-old Satish has shrapnel injuries all over his body. The Jay Krishna Goit-led armed outfit has taken responsibility for the blast claiming that the shop owner refused to give them money.