A Manus Island refugee protest has been blamed for risking the lives of Melbourne Cup racegoers when activists drove a car onto a train line and deflated its tyres.
The Ford Laser was driven across tracks at Ascot Vale on Tuesday, causing train delays of up to an hour ahead of the main race.
A female protester was left bolted to the steering wheel in the incident, with the vehicle later removed and the 27-year-old woman arrested, police said.
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A 27-year-old woman has been arrested after risking the lives of Melbourne Cup racegoers when a graffitied car was driven onto a train line in protest of Manus Island
The Ford Laser (pictured) was driven across tracks at Ascot Vale on Tuesday, causing train delays of up to an hour ahead of the main race
'They left the vehicle in situ with the tyres down and a female protester was bolted to the steering wheel,' Superintendent Tim Hansen told reporters at Flemington.
When police arrived at the scene about 20 protesters scampered, leaving the woman in the car to be extracted by firefighters.
The Moonee Ponds woman is likely to be charged with conduct endangering life, careless driving and unlicensed driving, Supt Hansen said.
Racegoers were forced to pile out of trains and walk to the Melbourne Cup after they were brought to a halt by the graffitied car.
Passengers were warned by Metro Trains to expect delays of more than an hour as the Melbourne Cup's 3pm jump time loomed.
'We are really appalled at the situation on Manus Island and we think it's really inappropriate for people to be celebrating when there are individuals with no water and no security,' protester Sonia Arquette told AAP on Tuesday.
When police arrived at the scene about 20 protesters scampered, leaving the woman - who was bolted into the car - to be extracted by firefighters
The delays forced racegoers to get out onto the tracks and walk the rest of the way to the Melbourne Cup (pictured)
The 27-year-old Moonee Ponds woman is likely to be charged with conduct endangering life, careless driving and unlicensed driving, Superintendent Tim Hansen said
The car was spray painted with messages including: 'evacuate Manus', 'justice for refugees' and 'animal liberation - human liberation'.
The group claimed they were not aligned with any organisation.
'We don't want to be doing this but we feel we have no choice when there are 600 people starving,' Ms Arquette said.
In a separate event, two woman also climbed a crane at Flemington racecourse, unfurling a banner which read 'SOS: Evacuate Manus Now'.
'We are joining with others