A hypodermic needle-wielding robber has struck again in The Bronx.

According to investigators, the suspect attempted to rob a fourth person in Westchester Square after previously threatening and stealing from three teenagers. They say he tells victims that he will inject them with the HIV virus.

One witness believes the man is targeting students from Lehman High School.

Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS.