Boston — A man under surveillance by terrorism investigators has been shot and killed by a Boston police officer.

Police Commissioner William Evans confirmed from the scene that the man shot at about 7 a.m. at a pharmacy in the city's Roslindale neighborhood has died.

Evans said the man was under surveillance by the Joint Terrorism task Force. His name was not made public.

Evans says when a city officer and FBI agent approached the man to talk to him he pulled a military-style knife and lunged at them.

The suspect was taken to a hospital where he died.

Evans says the officer and agent were also taken to the hospital for evaluations.

The shooting is under investigation. No other information was immediately available.