Two of the senior citizens killed when their tour bus crashed on a Chilean mountainside were being honored Sunday with a graveside service.

Arthur Kovar, 67, and his wife, Frieda, 74, were part of a 64-member tour group organized by the Jewish organization B'nai B'rith that was traveling aboard the cruise ship Millennium. They were among 12 people who died earlier this week while returning from a side excursion to a mountain national park.

An afternoon service was arranged for the Kovars at Mount Lebanon Cemetery.

Another Sunday service was scheduled at Congregation Agudath Sholom in Stamford, Conn., for Linda Greenfield, 63, and Ira Greenfield, 68.

The others killed were identified by Chilean authorities as Marian Diamond, 76; Hans Wilhelm Otto Eggers, 72, and his wife, Maria Eggers, 71; Barbara Rubin, 69, and her husband, Robert Rubin, 72; Shirley Bier, 76, and her husband, Marvin Bier, 79; and Carole Ellen Ruchelman, 63.

Services for Marian Diamond, the Rubins and the Biers were scheduled for Monday. Arrangements for the other victims were still pending.

The driver of the bus remained hospitalized under police watch as Chilean authorities try to determine the cause of the wreck, prosecutor Manuel Gonzalez told Chilean television.

Gonzalez said the driver may have fallen asleep on the curvy road and could be charged in the deaths.