ANKARA, Turkey—Military prosecutors investigating the downing of a Turkish plane by Syria say initial findings show Syria targeted the plane with a long-range missile while it was in international air space.

The report carried by the state-run Anadolu agency on Wednesday backed Turkish government claims. Syria has insisted the plane was hit by anti-aircraft artillery while flying low in Syrian air space.

The report says radar data and an inspection of the wreckage show the plane was not hit, but that it lost altitude and crashed from the power of a missile blast near its rear.

The plane went down in the Mediterranean Sea near Syria, killing its two pilots.

The June 22 incident further strained ties between the two neighbors.