Two grenades were hurled near a chariali in Gossaigaon town and near a cinema hall there at around 6.15 pm but none was injured, the sources said.
In the second incident, another two grenades were exploded at 7 pm near a petrol pump at Patgaon under Serfunguri police station injuring the three persons, the sources said.
The injured were admitted to RNBC hospital in Kokrajhar.
At Sonarpur the attackers also fired several rounds of bullets in the air before fleeing away, the sources added.
The attackers fired in the air at Habrubeel too, under Gossaigaon police station but no casualty reported so far.
Senior police and civil officials have rushed to the sites.
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