All employees were told to evacuate the building.
Newsrooms across the country have been on high alert since a gunman killed five employees last month inside the Capital Gazette in Annapolis. Police said alleged shooter Jarrod Ramos, 38, fired a shotgun and armed smoke grenades at staffers, killing five, and was then swiftly taken into custody by officers who rushed into the building.
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The Bee says it installed new security measures at the building, including key card entrances that prevent intruders from accessing work spaces.
The Associated Press contributed to this story.