Three children were killed and six others injured when a four-wheel drive vehicle with nine persons on board met with the accident on Thursday near Samad Al Shams in Ibra, about 140 km from Muscat, The Oman Times reported.
Two seriously injured women are battling for their lives in hospital.
Sunil Kumar Tharol and his family were travelling in the vehicle along with family friends Deepu Nair and Gopu Nair in Ibra when the accident occurred. Gopu had come from London to meet his brother Deepu, who lives in Oman.
The wives of Tharol and Gopu - Sreeja and Adhu, respectively - are in a critical condition.
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In another accident, Indian expatriate Anil Kumar (39) from Kerala died after he was hit by a vehicle near a hypermarket in Khadhara on Thursday.
The vehicle fled from the scene without stopping and Kumar died instatntly, his friends said.
An Ibra Technical College lecturer's mother died in another accident on the same day. Vimalakumari (60) died when a vehicle she was travelling in collided with a truck.
Vimalakumari's husband and her daughter-in-law are being treated in hospital.