Investigators on Thursday presented evidence pointing to North Korean involvement in the sinking of the Navy corvette Cheonan on March 26, including the font style of the serial number 1 handwritten on the rear part of the salvaged propulsion shaft of a torpedo.

It was compared with a North Korean training torpedo retrieved in 2003, which bears the serial number 4 in Korean.

It is clear that the torpedo was made by the North, given that only two countries, South and North Korea, use Hangeul for inscriptions on weapons such as torpedoes, and the fragment did not come from the South, a spokesman for the investigators explained.