Bereaved families lay flowers at a memorial ceremony marking the fourth anniversary of the sinking of a sightseeing boat off the Shiretoko Peninsula, on Thursday in the town of Shari, Hokkaido. | JIJI

SHARI, HOKKAIDO –

Bereaved families and others on Thursday mourned victims of a sightseeing tour boat’s sinking in Hokkaido on the fourth anniversary of the accident, which killed 20 people on board and left six others missing.

At a memorial ceremony in the town of Shari, attendees observed a moment of silence as a siren sounded shortly after 1 p.m., around the time when the accident involving the Kazu I boat is believed to have occurred off Kashuni Waterfall in the Shiretoko Peninsula four years ago.

“We won’t let the accident be forgotten,” Shari Mayor Hiroaki Yamauchi said in a speech.…