CAMBRIDGE, MASS. (WHDH) - A teenage male from Cambridge was arrested Tuesday after police said he allegedly stole a BMW with a dog inside from a site in Brookline, Cambridge police announced. 

Police said the teen, aged 15, was taken into custody Tuesday morning after what police described as a “multi-day regional investigation” that started on Saturday. Police said a woman went into a TJ Maxx on Harvard Street in Brookline, leaving her dog, Millie, inside the car parked outside. Police said the woman left the push-to-start car’s key in its console. She then returned from the store around 4:15 p.m. to find the car had been taken, according to police.

“I ran in to return something and came out and my car was gone with Millie in it,” the dog owner, Deborah Dowd, told 7NEWS. 

Police said they received a call around 4:45 p.m. reporting a vehicle matching the description of the stolen car in the area of Amherst and Wadsworth Street in Cambridge. The car’s operator, police said, got out of the car and pushed Millie out before backing up and nearly injuring three students in the area. 

Police said the students and police responding to the area safely recovered Millie. Police said officers later found the BMW parked and unoccupied on Winter Street shortly after 5:30 p.m. 

MIT police noted this incident earlier this week, saying graduate students contacted Dowd using information on Millie’s tags.

“They were very sweet,” Dowd said of the students. “They took great care of her for the few hours they had her.” 

The students brought Millie to a dorm room until Dowd was able to pick her up. 

While initially shaken, Dowd said Millie is now “back to her typical self.”

Cambridge police said a description for the suspect in this case matched the description of a teen who was arrested last week for a carjacking in Medford in February.  

Police said the teen was taken into custody for warrants from Norfolk and Middlesex juvenile courts including larceny of a motor vehicle and larceny over $1,200. 

Police said additional charges out of Cambridge are expected.

The teen is currently in the custody of the Department of Youth Services.

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