One Chinese-made hand grenade planted by unidentified persons was found at the complex of a fuel station at Khangabok in Thoubal district while another hand grenade was discovered at Kwakeithel, a police officer said.
A bomb squad of Manipur Police came to retrieve the explosive device and safely detonated at a safe distance, the officer said.
Meanwhile, locals organised a sit-in protest and condemned the act of planting the bomb in public area and urged the responsible group to own it up.
In another incident, a hand grenade was discovered at the residence of an engineer at Kwakeithel area early morning.
Police said the medium-intensity grenade was safely brought out at a paddy field and detonated two hours later.
