Five members of late Bollywood actor Sushant Singh Rajput's family have been killed in a road accident in the eastern Indian state of Bihar.

The accident occurred on Tuesday when nine relatives of Sushant were returning to Jamui district from state capital Patna on a sports utility vehicle (SUV) after attending the last rites of another relative.

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"A speeding truck coming from the opposite direction rammed the SUV in the Halsi area of Lakhisarai, in which 10 people, including the driver, were travelling," police officer Awadhesh Kumar told the local media.

"The impact of the crash was such that six occupants -- the five relatives of Sushant and the driver -- died on the spot. The truck driver managed to flee the spot," he said.

Four other relatives sustained injuries in the accident and were admitted to hospitals in Lakhisarai and Jamui, the officer said. "We suspect that the SUV driver dozed off at the wheel."

The deceased were identified as Laljit Singh, his two sons -- Ram Chandra Singh and Amit Shekhar -- daughter Baby Kumari and niece Anita Devi, as well as SUV driver Pritam Kumar.

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An FIR for rash and negligent driving has been filed against the truck driver. "Efforts are on to nab the driver of the killer vehicle," the police officer said.

Sushant was found hanging from a ceiling fan in his Mumbai flat on June 14 last year. An autopsy revealed the 34-year-old took his own life. A federal investigative agency probe also confirmed the autopsy report.