Another bomb went off in the northern peninsula of Jaffna on Monday but there were no casualties, military officials said.
Security had been stepped up in the area following the weekend bloodshed.
Security forces also found 270 sticks of dynamite in the northern district of Vavuniya, the military said.
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No arrests were made.
The government said it "strongly condemned" Saturday's night murder of Tamils in the navy-controlled islet of Kayts and pointed a finger at the rebel Liberation Tigers of Tamil Eelam (LTTE).
"Minister Keheliya Rambukwella, spokesman on security matters, said the ruthless killing of Tamil civilians could very well be a part of the LTTE strategy to divert international opinion," a government statement said.
The LTTE in turn blamed the navy for killing the civilians in an area where it said the guerrillas had no access.
"The slaughter of these civilians is seen by the local people as a punishment and a warning to others for not yielding to the demand of the Sri