Colombo: Sri Lankan air force jets bombed the Tamil rebel stronghold of Kilinochchi on Thursday, killing at least five people, a rebel official said, further deepening a crisis that risks an all out war.

Four bombs were dropped some 600 metres away from a hospital and destroyed a civilian home, the Tamil Tigers' military spokesman Rasiah Ilanthirayan said by telephone from Kilinochchi.

"The bomb smashed the house to bits," Ilanthirayan said.

"The deceased were a family of five. The father, the mother, their two children and a grandmother. This is state terrorism. The civilised world should condemn it." Sri Lankan military spokesman Brig Prasad Samarasinghe confirmed the air raids.

"We have taken two targets," Samarasinghe said a base for Sea Tigers near Mannar in the northwest, away from Kilinochchi, and a rebel training area in Kilinochchi. He said he had no details of the damage caused.