There have been six incidents since late April, including three in the last two weeks.
All of them have taken place aboard the number 7 train in Queens, several occurring when the door opened. The victims are women in their 20s to 40s.
The NYPD says the thief grabs the jewelry off the necks of the victims and then flees through the subway station.
In one case, a victim followed him up to the mezzanine area asking for her property back, before the man argued back and took off.
Police released surveillance images of the suspect, who is described as a black male, 40-50 years-old; last seen wearing a long sleeved white shirt, black pants and black shoes.
NYPD says this man has been snatching necklaces off women; 6 times since late April. All on the 7 train btwn 42nd St to 61st St/Woodside Ave stops, between 1:30pm to 6:30pm. He’s believed to be 40-50 years-old. Cops say he struck twice last Friday, 4 mins apart. pic.twitter.com/BUnPeqVopP— CeFaan Kim (@CeFaanKim) June 7, 2019
The NYPD has added extra officers to patrol the 7 line because of the robberies.
Anyone with information is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). The public can also submit their tips by logging onto the Crime stoppers website at WWW.NYPDCRIMESTOPPERS.COM or by texting their tips to 274637 (CRIMES) then enter TIP577. All calls are strictly confidential.
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