It's become a hot topic in the world of sports, and now it's the subject of an investigation.

French police are looking into the crash in which a Tour de France television car sideswiped two cyclists.

Spanish rider Juan Antonio Flecha and Johnny Hooglerland fell after a car swerved on the ninth stage on Sunday. Police have interviewed the driver, as well as witnesses.

The police want to know why the car swerved, and why it was trying to pass the riders on an narrow road.

Here's a look at the video fo the crash.