Sri Lanka's military says warplanes have bombed Tamil Tiger rebel positions in the island's east for a second straight day.

Wednesday's air raids were part of an effort to take the eastern region of Thoppigala from rebel control. There was no information on damage or casualties.

Airstrikes began Tuesday after Sri Lankan soldiers killed four Tamil Tiger fighters in a clash along the line that separates government and rebel-held territories.

Also Tuesday, a roadside bomb blast killed three Sri Lankan soldiers in the northern district of Vavuniya.

Officials believe Tamil Tiger rebels were behind the attack.

The Tigers have been fighting for independence in the nation's north and east since 1983, saying that ethnic Tamils are oppressed by the nation's Sinhalese majority.

Some information for this report provided by AP and AFP.