Sri Lankan Navy personnel were pelted with stones last week while trying to apprehend a group reportedly engaging in illegal sand excavations in Vadamaradchi.
One Coast Guard member was injured in the incident which occurred last Friday at Vallipuram, Vadamaradchi.
While the alleged attackers escaped, naval reinforcements were called to the scene with the heavy military presence causing tension in the area over the weekend.
Sri Lankan State Defence Minister Ruwan Wijewardene said he had discussed the incident with the Navy Commander and stressed the need to arrest the suspects, reports the Island.