Police in Annapolis, Md., were reportedly warned years ago that Jarrod W. Ramos - the suspect in Thursday's deadly shooting in the newsroom of the Capital Gazette - "will be your next mass shooter". Ramos (38) appeared by video link from jail and did not speak during the proceedings.
Sgt. Jacklyn Davis, a spokeswoman for Anne Arundel County police, said the letters were received Monday.
Prosecutors said Ramos barricaded a back door to prevent people from fleeing.
First-degree murder charges were filed Friday against a man with a grudge against Maryland's capital newspaper after police said he shot his way into the newsroom, killing four journalists and a staffer and wounding two others.
Editor Rick Hutzell was quoted: "We are heartbroken, devastated. No matter how deep our loss is nothing compared to the grief our friends' families are feeling", Capital editor Rick Hutzell was quoted in the paper's front-page story.
The Capital Gazette itself reported that crime reporter Phil Davis, in the building at the time, said he and others hid under desks. He tweeted, "there is nothing more terrifying than hearing multiple people get shot while you're under your desk and then hear the gunman reload".
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Authorities say Ramos, who was apprehended, used a shotgun and smoke or flash-bang grenades in the attack.
As part of that edition, the opinion page was left "intentionally blank", the editors wrote, to commemorate the victims of what officials called a "targeted attack".
Hours after a gunman blasted his way inside The Capital Gazette on Thursday, the surviving staff tweeted out their defiance: "Tomorrow, this Capital page will return to its steady goal of offering readers informed opinion about the world around them".
The shooter had no identification when he was apprehended, and the Federal Bureau of Investigation found no information about him immediately in the system, a law enforcement source said.
Read the editorial in its entirety on the Capital Gazette's website.
Ramos filed a lawsuit against the newspaper for defamation in 2012, one year after it wrote about his guilty plea to criminal harassment in a column. In another tweet, he discussed how he'd enjoy seeing the paper stop publishing, but "it would be nicer" to see two journalists "cease breathing".
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Threats against the paper had been made as recently as the day of the shooting, Anne Arundel County Deputy Police Chief Bill Krampf said.
A woman whose harassment by the suspect charged in the Capital Gazette shooting said she immediately panicked when she learned of the attack.
Police said five people were killed.
A statement of probable cause obtained Friday by The Associated Press says surveillance video captured Thursday's events at the Capital Gazette.
The Capital Gazette is one of the oldest papers in America.
Ramos took to Twitter, where he routinely harassed journalists from the newspaper in scores of profanity laced tweets. We are close. We are family.
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