Associated Press, Sat
Officials said the bus wreckage indicated that a suicide bomber may have been behind the attack, which ripped through the bus on the crowded southern coast road early Saturday afternoon.
``There is a female body inside the bus, and looking at the damage the blast has caused around her, we suspect that she could have been a suicide bomber,'' said senior police official Upul Ariyaratne.
About 65 passengers had been on bus, Ariyaratne said, and some 40 had been admitted to hospitals.
The Tigers have made suicide bombings a hallmark of their two-decade campaign to carve out a separate state for the minority Tamils, who suffered years of discrimination by the Sinhalese-dominated government.
However, the Tigers denied any role in Saturday's bloodshed.
``We totally deny that (the bus bombing). We did not do that,'' the rebels' military spokesman, Rasiah Ilanthirayan, told The Associated Press by telephone from the group's northern stronghold, Kilinochchi.
Sri Lankan officials said the two bombings six people were killed in a similar bus attack Friday on a highway northeast of
``The LTTE is losing their strength in the east. Because of this, they are targeting innocent civilians,'' said military spokesman Brig. Prasad Samarasinghe.
Both bus explosions came days after the rebels warned the government of ``serious repercussions'' for government airstrikes they said had killed 16 Tamil civilians, including eight children, in a Tiger-controlled northwestern area. The military said it targeted only rebel positions in the airstrikes Tuesday.
``This looks like a retaliatory attack for the air force raids,'' said Sunanda Deshapriya, an independent political analyst.
``The LTTE has gone back to its previous tactic of attacking Sinhalese civilians,'' Deshapriya said. ``It wants to send a message through terror again.''
In other violence Saturday, three separate roadside bombings, blamed on the insurgents, killed four soldiers and a civilian in the north.
A 2002 cease-fire between the rebels and the government has come under serious threat as more than 3,600 fighters and civilians were killed in renewed fighting in 2006. The cease-fire still officially holds.
The civil war has claimed about 68,000 lives, and displaced 1.6 million people.
Associated Press writers Dilip Ganguly and Ruwan Weerakoon contributed to this report.