The suspect, who has been described by police as a white male, remains unidentified, and there is also now no information on motive. Frashure described the gunman's weapon as a "long gun", while CNN reported witnesses describing it as a shotgun.
According to reports, around 6 people were shot at in the newspaper office on Thursday afternoon in US.
Davis later tweeted the gunman "shot through the glass door to the office and opened fire on multiple employees".
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Gillibrand said, adding the protests were an "amazing" act of defiance against the Trump administration. Margarita Perez held up a Mexican flag as speakers addressed the crowd in Albuquerque, New Mexico.
Television reports depicted people leaving the building with their hands up, as police urged them to depart through the parking lot.
The suspect was apprehended, Sheriff Ron Bateman told Fox News, but local police confirmed news of an "active shooter situation" on Twitter.
Phil Davis, a crime reporter at the Baltimore Sun-owned newspaper, tweeted about the shooting while waiting to be interviewed by the police. He is also reportedly refusing to identify himself to authorities but is being held in custody.
According to an Anne Arundel County Police spokesman Mark Limansky, officers were in the process of searching the building.
He also tagged the Sun and police that a reporter was shot.
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Davis said he and others were still hiding when the shooter stopped firing.
The building was evacuated and appears to be secure, officials said.
Gov. Larry Hogan tweeted that he was "absolutely devastated to learn of this tragedy in Annapolis".
Lindsay Walters, a White House spokeswoman, offered the Trump administration's "thoughts and prayers" to "all that are affected".
On Twitter, Davis said he was interviewed by police and was not sending messages while under his desk.
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About 7.9 million of the 17.2 million vehicles sold in the US a year ago were imported, according to LMC. Similarly, a third of Honda vehicles delivered in the USA throughout 2017 were built overseas .
Following speculation that the shooting may have been motivated by hostility for the media, police in Baltimore and New York City have stationed officers at newsrooms for protection. He said he was "praying for those at the scene and for our community".