Canadian Prime Minister Justin Trudeau vowed his government will get answers after a Ukrainian passenger jet crashed, killing 63 Canadians, just minutes after taking off from Iran’s capital.

The flight included many international students and a family of four. Trudeau said Wednesday his foreign minister is in touch with the government of Ukraine and his transport minister is reaching out to his international counterparts. Getting answers from Iran might prove difficult as Canada closed its embassy in Iran in 2012 and suspended diplomatic relations.

The crash of the Ukraine International Airlines plane came hours after Iran launched a ballistic missile attack on Iraqi bases housing U.S. soldiers, but Iranian officials said they suspected a mechanical issue brought down the 3½-year-old Boeing 737-800 aircraft. Ukrainian officials initially agreed, but later backed away and declined to offer a cause while the investigation is ongoing.