Nigeria has conveyed concerns over the security of its nationals and demanded immediate arrest of those who killed a Nigerian in Goa last week,prompting the government Tuesday to assure it that all issues will be addressed in a cooperative manner. The MEAs official spokesperson Syed Akbruddin said,The ministry is in touch with the Goa government on the issue as law and order is a state subject. The ministry has been told by the state that the investigation in the case was on track,he said,adding that the MEA was expecting a report in a couple of days. The Nigerian High Commission said,We have lost one of our nationals in a cold-blooded murder. We have raised the issue with India and written a note verbale on Friday to convey our concerns over the security of our nationals. The guilty should be immediately apprehended and brought to justice.