The car's owner reportedly left the vehicle running on Union Street in Park Slope on Saturday evening when someone hopped inside and sped off.
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Brandon Simeon, 54, who has autism, was still in the back seat. Simeon is approximately 5'6" tall and approximately 125 pounds. He was last seen wearing a green polo shirt and black pants.
The vehicle is a black 2010 M35 Mercedes with license plate 'FAL7278.'
Anyone with information is asked to call police.
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