Police are urging Darien residents to lock their cars after a 2006 BMW 750i was reported stolen from a driveway on Sunswyck Road during the early morning hours of Friday, Nov.20.

The car, which had been left unlocked in a residential driveway, was reported missing at 7:43 a.m. According to police, the owner parked the car at 9 p.m. Thursday, Nov. 19, and noticed it missing at about 7:30 a.m. on Friday. The owner also reported seeing a suspicious vehicle parked on the side of the road at the same time Friday morning.

The suspicious vehicle was a 2009 Subaru Impreza, according to Capt. Fred Komm of the Darien Police, who said another resident had reported the seeing the Impreza at 5:30 a.m.

"We knew it was there at 5:30 this morning, because a resident had reported seeing it then," Komm said.

When police investigated the Subaru, they found that someone had attempted to light the car on fire. According to Komm, there is fire damage to the rear seat, where someone had ignited paper in an attempt to burn the car. When the doors were closed, the oxygen flow in the car was cut off and the fire extinguished, Komm said.

"We have no idea why. There was nothing in the car," he said. "Sometimes they do it to destroy DNA evidence like fingerprints."

The Subaru was reported stolen from a Greenwich residence on Nov. 12, according to police. The Darien Police Department is working with the Greenwich PD to investigate the incident.

"I know Greenwich is looking at suspects from the Bronx, N.Y., which is consistent with what we had with our [car theft on Nov. 7], because that other car was reported stolen out of the Bronx, so there's perhaps a link there," Komm said.

A 2002 Land Rover was reported stolen from a residence on Driftway Lane at 9:15 a.m. on Saturday, Nov. 7. In that incident, a 1995 Lexus ES300 had been "dumped" nearby. Eighteen cars were burglarized that weekend, in what police believed to be related incidents.

Another resident on Sunswyck Road reported having two vehicles entered during the early morning hours on Friday. Both cars were unlocked in the resident's driveway.

Police are conducting a neighborhood canvas to identify any additional break-ins and thefts, according to Komm.

"Lock your cars and definitely don't leave the keys in it," Komm said. "Again, this is a crime of opportunity. They probably would have left the vehicle if the keys weren't left in it. They probably wouldn't have stolen it."

Police ask Darien residents to call the PD at 203-662-5300 with any information about suspicious vehicles or possible break-ins.