Three Japanese tourists died Monday when their sightseeing bus tumbled from an expressway west of Paris.
Eleven other Japanese tourists, as well as the Belgian driver and a Japanese tour guide, were injured.
Police said the vehicle crashed through a guardrail on a curve and ended up on its side in a ditch.
The driver said he has no idea what caused the accident, French public radio quoted police as saying.
The bus was carrying six men and eight women, mainly from western Japan, as well as the driver and a female Japanese tour guide, according to Nippon Travel Agency Co., which arranged the tour. The three confirmed dead were a 28-year-old woman and a 29-year-old man, both from Okayama Prefecture, and a 58-year-old woman from Hyogo Prefecture, according to Nippon Travel.
A 64-year-old woman from Hyogo Prefecture was in serious condition, and the 10 other passengers, the driver and the tour guide suffered minor injuries, the travel agency said.
The bus was on its way to Mont St. Michelle abbey.