Northeastern district of Trincomalee on Thursday. The breakaway Karuna faction of Liberation Tigers of Tamil Eelam (LTTE) attacked three bunkers of their rivals on Thursday morning killing at least 15 Tiger cadres, news agency Press Trust of India reported from capital Colombo. The attack came a day after eight people were killed in a mine attack in the neighbouring district of Batticaloa in Eastern Srilanka.The upsurge in violence came as the LTTE and Colombo were due to meet in Norway capital Oslo later on Thursday to discuss the safety of Norwegian truce monitors, according to the news agency.