(AP) - An investigation proved that a Dutch marine serving with the U.N. mission

in Cambodia was accidentally shot to death by a colleague, a U.N. spokesperson said

on July 27.

The marine, identified as Rico Bos, was killed in northwestern Cambodia in mid-July,

said U.N. spokesperson Susan Manuel.

U.N. officials had originally said the marine accidentally shot himself. But the

Dutch defense ministry said a fellow marine in a neighboring tent has admitted he

accidentally fired the round that killed Bos. Manuel confirmed that report.

The 18-year-old marine apparently was the first of more than 800 Dutch troops with

the U.N. peacekeeping operation in Cambodia to die during the U.N.'s 16-month mission.