The bodies of four Japanese tourists killed in a recent hot air balloon crash in Egypt arrived Monday evening at Narita airport, accompanied by their nine relatives.

The relatives arrived in Cairo on Thursday and viewed the bodies in a hospital morgue. They also traveled to some of the tourist spots visited by the victims prior to the accident, including the Great Pyramid of Giza.

The four victims are Kazuo Tsuge, a 66-year-old Tokyo resident who was chairman of a racehorse transport company, and his wife, Harumi, 63, as well as Yasuhide Terada, 63, and his 63-year-old wife, Asako, who also lived in Tokyo.

Nineteen tourists died in the crash in Luxor, a tourist spot popular for its ancient ruins. An investigation panel formed by the Egyptian government and prosecutors are seeking to identify the cause of the accident.