At least 30 Tamil Tiger rebels and five government troops were killed in fresh clashes on Tuesday across Sri LankaÂ’s embattled north, the defence ministry said.Pre-dawn fighting erupted in the coastal district of Mannar where the rebel Liberation Tigers of Tamil Eelam (LTTE) tried to re-take territory they lost to security forces this week, the ministry said. The ministry said most of the rebel casualties were women fighters, though there was no immediate word from the guerrillas. So far this year, the defence ministry has reported that security forces have killed at least 1,987 rebels while 123 government soldiers have died.