Strongly condemning the 'dastardly' killing of Jammu and Kashmir Minister Ghulam Nabi Lone, Prime Minister Manmohan Singh said on Tuesday that efforts to disturb peace in the state would be thwarted.

"The Prime Minister condemned the dastardly attack and said efforts to hamper earthquake relief work and disturb peace in the state will be thwarted," Dr Singh's media adviser, Sanjaya Baru, said.

Dr Singh has sent his condolences to the family members of Lone and spoken to Tarigami enquiring about his welfare, Baru said.