The first floor of the Boston Police District 4 station in the South End was partially evacuated today after a letter arrived in the mail containing a suspicious powder. By this afternoon, four more stations had received similar letters and police had identified the substance as tea.
The first envelope was discovered at about 10 a.m. at the Harrison Avenue police station. The Boston Fire Department hazardous materials unit responded and eventually determined the material in the letter was not a public health threat.
The letters were also delivered to stations in Brighton, Dorchester, East Boston and Hyde Park But no evacuations were ordered because the substance had been identified.
Police have identified a person of interest, who has a history of writing letters to public agencies and including his or her name on the envelopes.
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