Update, 4 p.m.: Boston Police have identified a man shot and killed by police this morning as 26-year-old Usaama Rahim. 

Rahim was fatally shot by a Boston Police officer and FBI agent Tuesday morning in a CVS parking lot in Roslindale. Rahim confronted the pair with a knife he refused to drop, according to police.

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Police have been going in and out of an apartment at the Stony Brook Commons complex in Roslindale around the corner from the shooting scene since 3 p.m., confirming to WGBH News they're executing a search warrant in connection to the case.

Both the officer and agent were taken to local hospitals for observation but were not hurt.

— Tina Martin

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Update, 2:00 p.m.: The man fatally shot this morning in Roslindale was under surveillance by the region's Joint Terrorism Task Force, Boston Police have confirmed.

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Boston Police will have a press conference at 3 p.m. this afternoon with an update. 

— Tina Martin

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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.