The families of South Koreans killed in a Cambodian plane crash last year have sued the airline for US$3.9 million.

A plane chartered by Cambodia's PMT Air crashed into a mountain in June last year, killing all 22 passengers including 13 South Korean tourists.

South Korean investigators have accused the airline of failing to meet safety standards.

The Seoul Central District Court says 11 families filed the suit demanding compensation for loss of income, funeral fees and emotional stress.

In their petition they accuse PMT Air of failing to prevent human and mechanical errors.

The Russian-made AN-24 crashed on a forest-covered mountain near the southern Cambodian coastal town of Kampot.