Sri Lanka has assured India of cooperation in the investigation into the shooting of a Rameswaram-based fisherman K. Britjo, on Monday.

Sri Lanka’s Foreign Ministry on Tuesday said initial investigations indicated that the Sri Lankan Navy “was not involved in the incident”, but noted that irrespective of the parties involved, it was a matter of grave concern.

Late Monday, a group of fishermen returned to the Rameswaram jetty with the body of 21-year-old fisherman K. Bristo, and pointed to an apparent bullet injury on his neck. Fishermen leaders based in Tamil Nadu said he was among the six fishermen on board a mechanised trawler that the "Sri Lankan Navy targeted".