"They dropped three bombs at two locations and flew back," the source said. "The damage caused is insignificant, but the attack is symbolic.
It shows they have coordinates of military installations.
"
One soldier was injured in the attacks on what were bases for ground troops, the source said.
The defence ministry said the air force scrambled interceptor aircraft, but the guerrillas, who are fighting a major military campaign in the island's north, had withdrawn.
The ministry said that ground troops had been successful in beating back a two-pronged assault by the Tigers in the Weli Oya region on Saturday. However, the guerrillas had said that it was the military which initiated the assault.
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The defence ministry said seven Tiger guerrillas were killed in two separate clashes