Two fishermen who were fishing in a mechanised boat suffered serious injuries after some unidentified persons, who came in a country boat, hurled country bombs at them near Appa Thivu in the Gulf of Mannar region this morning, police said. Preliminary investigations revealed that the fishermen in the mechanised boat used banned fishing nets which was opposed by those in the country boat. The mechanised boat was damaged in the incident, police said. The injured Mohammed Ibrahim and Nishar Khan were admitted to government hospital here.