Ten people were also wounded in the attack on the Chenkaladi army camp, a military official in the area said.
The attack came a day after the Tigers carried out their first air raid, using single-engined planes to bomb a military air base adjacent to Sri Lanka's only international airport and killing three airmen and wounding 16 others.
Two separate teams are investigating the air strike -- an embarrassing blow to the country's defence establishment -- and President Mahinda Rajapakse also held an emergency meeting with political party leaders here on Monday night.
"The air power of a frenzied and desperate organisation as the LTTE is a grave threat aimed not only to Sri Lanka but also to the entire South Asian region," the president's office said in a joint statement.
It said political parties in Sri Lanka urged the international community to "make a proper assessment of this very real danger.
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The Tigers said the military carried out retaliatory air strikes inside rebel-hel