Police have put put out surveillance video of a man wanted for a series of knifepoint robberies in Manhattan.
They say he followed people into three different apartment buildings in East Harlem since October 1.
Once inside, police say he pulls out a knife and robs his victims.
Investigators say the man has gotten away with cellphones and cash.
Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.