Police say the alleged gunman used smoke grenades when entering the Capital Gazette before blasting his way into the newsroom, looking for his victims.
The gunman who went on a shooting rampage in a Maryland newsroom, killing five people and leaving others seriously injured overnight, has been identified.
Law enforcement sources have named the killer as Jarrod Ramos, who has previously sued the newspaper for defamation, according to local media sources.
Officials also releasedthe names of the five people killed in the shooting at the Capital Gazette.
Police secure the newspaper building where a gunman opened fire today. Photo / AP
Lt. Ryan Frashure of Anne Arundel County Police read the names at a news conference Thursday night (US time), hours after the shooting at the newspaper.
They are: Wendi Winters, John McNamara, Gerald Fischman, Rebecca Smith, and Rob Hiaasen.
Winters was the special publications editor. McNamara was a writer. Fischman was editorial page editor. Smith was a sales assistant. Hiassen was an assistant editor and columnist.
NBC News reported Ramos had a history with the paper, filing a defamation suit against it in 2012.
A US official said Ramos was identified using facial recognition technology after he damaged his fingerprints in what police believe was an attempt to prevent rapid identification.
McKerrow says he is working to cover the story with two Capital Gazette reporters and with assistance from colleagues at the Baltimore Sun, which is owned by the same company.
Reporter Chase Cook tweeted: "I can tell you this: We are putting out a damn paper tomorrow."
I can tell you this: We are putting out a damn paper tomorrow.
High school sports editor Bob Hough told the Associated Press he and a colleague were working on the sports section from his home. Hough, who wasn't at the office during the shooting, says he expects to publish a full section.
I've done some reporting since getting here. I was not here when shooting occurred. Details I have are a suspect is in custody and five people are dead. Specifically who died has not been released. Others injured but a count not avialable, police said. I'm devastated.
"There is nothing more terrifying than hearing multiple people get shot while you're under your desk and then hear the gunman reload," he tweeted.
Meanwhile, a GoFundMe account set up for the newspaper has raised more than US$20,000 within just three hours.
The account was set up by a fellow journalist, Bloomberg government reporter Madi Alexander. It urged people to give what they can to help the newspaper's journalists pay for medical bills, funeral costs, newsroom repairs and other expenses.