UNITED NATIONS (AP) — The U.N. secretary-general says “there is clearly a need for a full and transparent international investigation” into the plane crash in Ukraine.

Ban Ki-moon said during a media event Thursday that the International Civil Aviation Organization, a U.N. agency, is closely monitoring the disaster involving the Malaysia Airlines passenger plane carrying 295 people.

Ban adds, “I offer my deep condolences to the families and loved ones of the victims and people of Malaysia.”

Both Ukraine’s government and the pro-Russia separatists fighting in the region have denied any responsibility for downing the aircraft.

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