NEW BRUNSWICK, NJ — Police are trying to identify a man who's suspected of stealing a purse in the city's downtown and then warding off a good Samaritan by saying he had a gun, according to a press release.

The robbery took place around 8 a.m. July 24 on Spring Street, New Brunswick Police Capt. J.T. Miller wrote in the announcement.

A woman left the Starbucks on George Street and was then followed by the suspect, cops said. When they neared Spring Street, the suspect snagged her purse and ran down Church Street, toward George, according to police.

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A passerby who saw the theft then chased after the suspect, cops said. But that person gave up after the suspect said he had a gun, police said.

New Brunswick cops have yet to identify the suspect, though they unearthed several surveillance photos.

The African-American man is roughly 5 feet, 10 inches tall, police said. In the photos, he's wearing gray sweatpants and a red, long-sleeved shirt with the number “99” on the back.

Anyone with information should call Det. Drew Weiss at 732-745-5217.