A week after the first such incident, a second vehicle in Lower Macungie Township was stolen this week when someone found the keys inside, according to police.
From there, they helped themselves and drove away with the 2002 Isuzu Trooper, police said.
The sport-utility vehicle belongs to Craig Steven Nelson of the 1200 block of Butternut Lane, said state police at Fogelsville. The vehicle was taken from outside the residence between 7 p.m. and 7:15 a.m.
Police did not specify a break-in, so the vehicle likely was unlocked. A in which a vehicle door was unlocked and the keys left inside, was reported Jan. 17 in the 2000 block of Rolling Meadow Drive. A grey 2010 Toyota Camry was taken from that residence.
In the most recent motor vehicle theft, police said the vehicle is white and has a Pennsylvania registration of GLG-6731.
State police have for some time generally been reporting multiple thefts from motor vehicles in instances in which owners have left their vehicle doors unlocked. With few exceptions, thieves have not broken windows or otherwise forced entry, although even one of those incidents was reported Jan. 15 on Jarrett Farm Road.
The recent vehicle thefts have, however, brought a relatively new element to the situation.
Police continue to warn residents to lock their vehicles to deter thefts.
Also, anyone with information about the whereabouts of the Isuzu is asked to call police at 610-395-1438.