The incident occurred shortly after 5:30 a.m. on Twenty Second Street, in the Kipling Avenue and Lake Shore Boulevard area, after the owner of a minivan left the vehicle in the driveway to warm-up.
When the owner went inside, someone jumped in the van and attempted to drive off. Instead the minivan ended up driving across several lawns, smashing into garbage and recycling bins, hitting a parked pick-up truck on the street before crashing into the front porch of a nearby house, police said.
The suspect then exited the wrecked van and fled the scene on foot.
Police said the porch sustained notable damage, and they are investigating the incident.
The attempted theft comes just days after York Regional Police warned the public that 'warm-up' vehicle thefts are on the rise in the GTA.