Committee spokesman Wang Wei said two of the four van passengers died in a hospital. BOCOG said the other two passengers, one seriously injured, were still hospitalized.
"According to the investigation, the van was at fault and violated traffic rules," Wang said.
Two Croatian rowers, the doubles sculls team of Mario Vekic and Ante Kusurin, were on the bus but were not seriously injured. They competed later Wednesday and finished fourth in their semifinal.
Australian rowing team doctor Greg Lovell was also on the bus, along with several other Olympic-accredited people. No one on the bus was seriously injured.