"The investigative team has found a sizeable amount of circumstantial evidence from the aerial vehicles' characteristics and loaded equipment, that confirms the drones were sent by North Korea."
On Friday, the South Korean government revealed what it knows so far about the three unmanned aerial vehicles found crashed in Paju, north of Seoul, on the western island of Baengnyeong-do, and in Samcheok, Gangwon-do province.
The defense ministry said identification information on the parts used inside the drone's engines, data transmitter-receivers and computer chips appear to have been intentionally damaged, another factor that points the finger at Pyongyang.
And some of the drones carried a low-power analog video transmitter, thought to have been incapable of sending photos or video back to the North.
The other evidence that implicates the North are the color and shape of the fuselages.
They were very similar to the ones seen during North Korean founder Kim Il-sung's birthday parade two years ago.
Investigators, however, failed to decode the GPS coordinates for the drones' point of return, as they were concerned about damaging the information stored inside the Central Processing Unit.
A separate team of civilian experts from the South and the United States will probe the GPS system.
"The scientific investigative team will mobilize all efforts to find further evidence. This includes determining the drones' point of take-off by analyzing the photos, the data stored in the Central Processing Unit, as well as their travel routes."
If the final results confirm the drones to be from North Korea, Seoul says it will consider it a violation of the armistice agreement and take strong measures at the international level.
Choi You-sun, Arirang News.