MOKPO, South Korea (AP) — An off-duty captain of the sunken South Korean ferry has told investigators that the owners ignored his warning that the ship shouldn’t carry too much cargo because it wasn’t very stable, a prosecutor said Wednesday.

The captain, whom prosecutors will only identify by his surname, Shin, was on vacation on the day of the accident two weeks ago that has left more than 300, mostly high school students, dead or missing and has caused widespread shame and grief. The ferry was piloted April 16 by a substitute captain, Lee Joon-seok, who is now being detained along with 14 other crew members who were involved in navigating the Sewol.