The Indians, hailing from Kerala were killed while they were travelling to Muscat from Sur yesterday morning.
The victims have been identified as Fincer, Shibu Samuel, and Anil. The injured Indian has been identified as Iqbal. He is undergoing treatment for eye injuries at a local hospital.
The name of the Omani national, critically injured and lying in hospital is yet to be ascertained, the Times of Oman reported.
"All the four Indians were travelling to Muscat. Anil, friend of Shibu, had come on a visit visa to Oman last week. After, visiting his relatives in Sur, he was travelling back to Muscat when the tragedy happened," victims' friends said.
"The bodies are kept in Sur hospital," they added.