The accident occurred at around 4 a.m. local time when the van, traveling from Pekanbaru to Dumai, struck the rear of the truck, Riau Police Traffic Director Jeki Rahmat Mustika said, News.az reports, citing Xinhua.
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The five survivors were taken to the hospital for treatment.
Police have deployed traffic accident investigators to determine the cause of the crash and assess factors contributing to the incident.
