According to the expert quoted by The Guardian , nothing supports the theory that the Ukraine International Airline Flight 752 was shot down .
However , The Guardian quoted an expert saying available video evidence do not support shot-down theory and The New York Observer states that video evidence strengthen technical malfunction theory , because the airplane caught on fire turned back around toward the Tehran airport and then `` continued to maintain altitude , and then , exploded , rather than hitting the ground intact '' .
Ukraine International Airlines Flight 752