Sri Lankan fighter jets pounded two Tamil Tiger rebel bases deep in the northern jungles, and infantry clashes killed 27 rebels and two government soldiers, the military said Friday.  The planes bombed a base of the Sea Tigers, the rebels' naval wing, in their de facto state in the north early Friday, said air force spokesman Wing Commander Andy Wijesuriya.  Another air strike on a rebel military base in the guerrilla stronghold of Mullaitivu took place overnight, he said.