Sri Lankan officials say a roadside bomb explosion in the northern Jaffna peninsula has killed at least three soldiers.
No one has claimed responsibility for Thursday's blast but Sri Lankan authorities suspect Tamil Tiger rebels were behind it.
Tamil rebels were not immediately available for comment.
On Wednesday, the military claimed it had killed about 70 Tamil rebels and destroyed three of their camps in land and sea battles in the east and north of the island nation.
Violence has increased in Sri Lanka over the last year despite a 2002 ceasefire and attempts by international mediators to bring the government and rebels back to the negotiating table.
An estimated five-thousand people have been killed in the past 19 months.
Tamil Tigers have been fighting since 1983 for a separate homeland for Sri Lanka's minority Tamils, citing decades of discrimination by Sinhalese-majority governments.
About 65-thousand people have been killed in the conflict.