The evidence is pretty clear.
Fresh off the back of the LaFerrari crash in Monaco comes a report that another model has caught fire. While taking part in the Trento-Bondone Hill Climb in Italy, the LaFerrari reportedly had "flames from bottom rear." These images show damage to the back end that look to have been caused by fire, while the following video, courtesy of Babylon Car Video, shows the LaFerrari with smoke billowing from its rear diffuser.
Head to around the 36-second mark to check it out.