At least six civilians were killed in separate incidents across Sri lanka's embattled northeast, the defence ministry said on Friday.
Security forces found the bullet-riddled bodies of three men in the Jaffna peninsula where another man had been similarly shot dead by unidentified attackers on Thursday, the ministry said.
It said a local postman was also shot dead in Jaffna and blamed that killing on Tamil Tiger rebels.
The guerrillas were also blamed for another killing in the eastern district of Batticaloa on Thursday.
Sri Lankan war planes on Thursday bombed suspected Tiger targets in the Jaffna peninsula, the air force said.
Israeli-built Kfir jets pounded positions of the Liberation Tigers of Tamil Eelam (LTTE) in the southern sector of the peninsula where there are daily skirmishes between troops and the rebels.
The pro-rebel Tamilnet website said the military had also intensified artillery attacks from positions along the front line while Kfir jets dropped nine bombs and destroyed five civilian homes.
Tamilnet did not say if there were casualties among the civilians.
The new wave of violence comes amid renewed efforts by peace broker Norway to arrange face-to-face talks early next month in Oslo between the Sri Lankan government and the Tamil Tigers.
Both sides agreed last week to try to salvage a truce in place since February 2002. More than 1,500 people have died in an upsurge of tit-for-tat violence in the past 10 months.
Tamil rebels are waging a drawn-out insurgency for a separate ethnic homeland in Sri Lanka, a majority Sinhalese nation. More than 60,000 people have died since the rebellion began in 1972.