Story highlights Victims: Philippines, Norwegian ambassadors and wives of Malaysian, Indonesian diplomats

They were among representatives from over 30 countries on a pro-tourism trip

Taliban says it shot down the chopper; Pakistan's military disputes this claim

Islamabad, Pakistan (CNN) Two ambassadors and the wives of two other ambassadors were among seven people killed when a helicopter crashed Friday into a school in northern Pakistan. Others -- Pakistanis and foreigners alike -- were injured.

One big question: Was it an accident, or was the helicopter attacked?

Pakistan's military believes a mechanical problem caused the Mi-17 helicopter to go down, army spokesman Gen. Asim Bajwa told CNN, citing an initial investigation.

But a spokesman for Tehreek-e-Taliban Pakistan, known as the TTP or Pakistani Taliban, insists this was no accident. Members of his militant group used a surface-to-air, shoulder-fired missile, Mohammed Khurrassani said.

The Taliban spokesman said militants had "a special plan to target" Pakistani Prime Minister Nawaz Sharif during his anticipated visit to Pakistan's Naltar Valley. Sharif wasn't part of the delegation in Naltar, but the TTP -- according to Khurrassani -- carried through nonetheless.

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