India on Thursday summoned Sri Lankan High Commissioner Prasad Kariyawasam to lodge a strong protest over the killing of a fisherman by Sri Lankan Navy, asserting that such incidents have no justification and calling on authorities there to desist from use of force. However, the Sri Lankan envoy denied involvement of his countrys Navy in the killing of the fisherman on Wednesday. Meanwhile, External Affairs Minister S.M. Krishna has sought a detailed report from the Indian High Commissioner in Colombo, who has taken up this matter with the Sri Lankan government and expressed deep concern and regret over it.