According to police, the car was parked at the Main Street Shell station while the owner was inside.
Officials say the occupants of a brown Nissan Altima entered the victim’s car and stole his phone from the vehicle.
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Police say the Nissan was later seen at the Cumberland Farms on Pershing Drive but fled the scene when officers arrived.
The Ansonia Police Department reminds residents to lock their cars and to never leave their cars running and unattended.
Anyone with information on the cell phone theft is asked to call Ansonia Police at 203-735-1885.