Police say the victim was held up by two suspects while he was parked on 47th Street in Borough Park around 12:30 p.m. on Friday.
They say one man went up to the victim's window and demanded he open his trunk.
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The victim opened his truck, and the suspects took out the jewelry and fled in a Ford Taurus with paper license plates.
The victim said the jewelry was owned by a jewelry store in Manhattan and was worth more than $1 million.
He was not injured, and no arrests were made.
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