Sri Lanka’s air force pounded Tamil Tiger rebel positions for a second day Friday in retaliation for a bus bombing that killed 64 people in the worst violence since a 2002 truce, a senior insurgent leader said. The Tigers said the airstrikes near a key rebel stronghold in northern Sri Lanka showed the government was on a war footing, even though the country’s president said he remained committed to the 2002 cease-fire. Full Story