The Liberation Tigers of Tamil Eelam (LTTE) said they were "distressed" over the lack of foreign concern at the strikes carried out by government forces after a suicide bombing targeted the island's army chief on Tuesday.
Residents said aerial bombings had stopped since Wednesday morning, but the government said it would continue to retaliate if attacked.
The rebels made no comment on Tuesday's bombing -- which left Lieutenant General Sarath Fonseka critically wounded and for which they were blamed by the government -- but said the ceasefire was in danger.
Ten people were killed and 30 wounded in the bombing at the heart of the high security army complex here.
Sri Lanka maintained it acted in self defence after the assassination attempt against the army chief and attacks on naval craft in the island's northeastern port of Trincomalee.
"The three forces of the government of Sri Lanka have conducted a heavy and cruel shelling, naval-gunboat firing and aerial bombing in Trincomalee, in M