Gardaí are understood to be investigating after a tyre on Dana's presidential campaign car blew out on a motorway, amid claims it may have been slashed.
The Independent candidate was asleep in the back of the car, which was being driven by her husband, when the incident happened near the toll-bridge on the M4 last night.
Dana's husband lost control of the car for a time and had to swerve to avoid a truck.
Gardaí have been asked to investigate whether the tyre may have been slashed while the car - which is emblazoned with Dana signage - was parked outside a Co. Leitrim hotel yesterday.
Dana has cancelled her campaign trips today.