Speaking at a press conference on Friday, Foreign Secretary Aizaz Ahmad Chaudhry ruled out the possibility of terrorism in the tragedy and said the crash occurred due to a technical failure of the engine of the helicopter, reported media.

"Pakistan Army had arranged top class security for the visitors and claims of TTP about hitting the helicopter are bogus," said the top diplomat, who was flanked by army and air force officers who provided details of the incident.

Ahmad added that under instructions of the Prime Minister, Pakistan Army had deployed about 1,000 troops for security purpose and all the surrounding mountain tops were covered by those personnel.

The foreign secretary said two Pakistan Army helicopters landed safely but the third one met with the accident due to a technical fault while landing.

Chaudhry said Prime Minister Nawaz Sharif had given permission for the trip comprising 30 diplomats. According to him, Pakistan Air Force had developed a skiing resort and chair-lift at Naltar (512 km from here) that was to be inaugurated by the Prime Minister.

He added that similar trips involving diplomats had been arranged in the past. An investigation board has been constituted by the army chief and some of its members have already reached the accident site, he said.

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