Based on Sahanur's confession, the National Investigation Agency (NIA) recovered the grenades near Rupohi river, about 500 metre from his house in Salbari sub-division, NIA sources said.
Sahanur, the alleged motivational trainer of terror group Jamaat-ul-Mujahideen Bangladesh (JMB), was arrested by Assam Police's Special Operation Unit from his relative's house in Nalbari district on December 6.