Puffer warning: Aurora police officers ticket multiple people for leaving running cars unattended

AURORA, Colo. - We're waking up to more sub-freezing temperatures Tuesday morning -- but do not leave your car unattended while it warms up.

That's the warning from the Aurora Police Department.

Officers were out ticketing "puffers" early Tuesday morning.

Police said they found their first puffer only one block from the station.

"Officers in District 2 already out with an illegal puffer," officials tweeted at about 5:30 a.m.

Just minutes later, officials tweeted, "Only a few feet away another officer is out with another puffer."

"Another puffer located. Ticket being issued," officials tweeted at 5:50 a.m.

According to Aurora police, 50 percent of all car thefts occurred because people left their keys in their vehicle.

"We just found a vehicle left running with the doors unlocked. Very easy target," police tweeted at 6:30 a.m.

About 10 minutes later officials tweeted, "Located another puffer in Dist 2. Key left in ignition in plain view."

"[Thieves] wait for cold mornings like this. Leaving ur keys in the car makes u an easy target," officials wrote.

At 6:30 a.m., officials tweeted, "In DIST 2 alone officers are currently out with five puffers."

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