NEW YORK (CBSNewYork) — Police are looking for help in finding a suspect wanted in connection with a Manhattan robbery pattern.

The suspect followed his victims into residential buildings on the Upper West Side and then approached them while they were in either the vestibule or entering the elevator, police said.

The suspect then simulates or displays a gun, and in some incidents displayed a knife, before robbing victims, authorities said.

The suspect is wanted in 10 incidents, with the latest coming on March 24 on West 109th Street.

Police described the suspect as black male, between 25 to 40 years old, between 5-foot-6 and 5-foot-11 and between 130 to 170 pounds.

Anyone with information in regards to these incidents is asked to call Crime stoppers at 1-800-577-TIPS (8477). 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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