The victim was walking with another woman and a small child in the 400-block of Market Street around 11:30 a.m. when she was approached by the man. He grabbed her by the neck and attempted to rip the chain off, police said.
After a brief struggle, the man left the scene without the necklace.
He is described as black, about 40 years old, 6 feet tall and weighing about 170 lbs. He was wearing a tan coat, gray hooded sweatshirt, blue jeans and dark boots.
Anyone with information is asked to call the police department's 24-hour tip line at 1-877-NWK-TIPS (877-695-8477). Tips are kept confidential and may result in a reward.
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