NEW DELHI, April 23 -- An Islamic centre in Sri Lanka that hosted several Islamic State recruits from Kerala before they left for Afghanistan or Syria merits investigation, senior National Investigation Agency officials said on condition of anonymity, although they added that there are no evident links between it and the terror attacks in the island nation on Sunday that killed close to 300 people.According to the NIA officials, many of these recruits travelled to Sri Lanka and were likely indoctrinated at the Islamic centre there, although they did not specify the name and the location of this centre....