Initial reports had it as a gunfight between the luxury SUV and the high-end sports car. But investigators don't think anyone in the Maserati was shooting, Sgt. John Sheahan said.
The Maserati driver, the taxi driver and a passenger in the cab were killed.
Several people were taken to the hospital, including a passenger from the Maserati. Four were taken to University Medical Center, where spokeswoman Danita Cohen said three were treated and released. The condition for the fourth was not released.
The incident was the latest in a series of violent actions on the tourist corridor since the beginning of the year. Two people were critically wounded in a shooting at a parking garage Feb. 6, and a tourist was stabbed in an elevator at The Hotel at Mandalay Bay on Feb. 16.
A spokesman for the Las Vegas Convention and Visitors Authority, Jeremy Handel, said his organization didn't immediately have a comment on the incident and deferred to the police unit that patrols the tourism district.