ANNAPOLIS, Md. – The gunman accused of killing five people in a vendetta against a Maryland newspaper barricaded the rear exit to prevent anyone from escaping and blasted his way through the newsroom with a pump-action shotgun, cutting down one victim trying to slip out the back, authorities said Friday.

“The fellow was there to kill as many people as he could,” Anne Arundel County Police Chief Timothy Altomare said as Jarrod W. Ramos, 38, was charged with five counts of murder in one of the deadliest attacks on journalists in U.S. history.

Ramos’ long-held grudge against the Capital Gazette included a string of menacing online messages and a failed defamation lawsuit over an article about him pleading guilty to harassing a woman. Police looked into the online threats in 2013, but the paper declined at the time to press charges for fear of inflaming the situation, Altomare said.

“There’s clearly a history there,” the police chief said.

Ramos was denied bail Friday after a brief court hearing in which he appeared by video, watching attentively but not speaking. Authorities said he was “uncooperative” with interrogators. He was placed on a suicide watch in jail. His public defenders had no comment outside court.

Three editors, a reporter and a sales assistant were killed in the Thursday afternoon rampage.

The bloodshed initially stirred fears that the recent barrage of political attacks on the “fake news media” had exploded into violence, and police reacted by tightening security at news organizations in New York and other places. But by all accounts, Ramos had a specific, longstanding grievance against the paper.

Neighbor Kim Wither prays at the scene where five newspaper employees were shot at The Capital Gazette’s office in Annapolis, Maryland, on Friday.

At the White House, President Trump, who routinely calls reporters “liars” and “enemies of the people,” said: “Journalists, like all Americans, should be free from the fear of being violently attacked while doing their jobs.”

Prosecutor Wes Adams said Ramos carefully planned the attack, barricading the back door and using “a tactical approach in hunting down and shooting the innocent people.” Adams said the gunman, who was captured hiding under a desk and did not exchange fire with police, also had an escape plan, but the prosecutor would not elaborate.

Few details were released at the court hearing on Ramos, other than that he is single, has no children and has lived for the past 17 years in an apartment in Laurel, Maryland. In the 2011 article that Ramos sued over, his lawyer said he had a degree in computer engineering and worked for the U.S. Bureau of Labor Statistics.

The attack began with a shotgun blast that shattered the glass entrance to the open newsroom. Journalists crawled under desks and sought other hiding places, describing agonizing minutes of terror as they heard the gunman’s footsteps and the repeated blasts of the weapon.

Some 300 local, state and federal officers converged on the scene and within two minutes police had begun to corner Ramos, a rapid response that “without question” saved lives, Altomare said.

The police chief referred to Ramos as “the bad guy,” refusing to utter his name because “he doesn’t deserve for us to talk about him for one more second.”

Jarrod Warren Ramos

Ramos was identified with the help of facial recognition technology because of what the chief said was some kind of “lag” in getting results from the computer system used to analyze fingerprints. Police denied news reports that Ramos had mutilated his fingertips to avoid identification.

The chief said the weapon was a 12-gauge shotgun, legally purchased about a year ago despite the harassment case in which Ramos pleaded guilty. Authorities said he also carried smoke grenades.

He filed his defamation suit against the Capital Gazette in 2012, but a judge threw it out as groundless when Ramos was unable to point out a single statement in the article that was false or give an example of how it had harmed him.

He so routinely sent profanity-laced tweets about the paper and its writers that retired publisher Tom Marquardt said he called police in 2013, telling his wife at the time, “This guy could really hurt us.”

The police chief said the newspaper didn’t press charges at the time because “there was a fear that doing so would exacerbate an already flammable situation.”

In 2015, Ramos tweeted that he would like to see the paper stop publishing, but “it would be nicer” to see two of its journalists “cease breathing.”

The victims of the shooting in the newsroom of the Capital Gazette in Annapolis. From left, John McNamara, Wendi Winters, Rob Hiaasen, Gerald Fischman and Rebecca Smith.

The online grudge apparently “went dark” for a period until some new posts just before the killings, Altomare said. But the chief said police were not aware of Ramos’ recent online activity until after the rampage, saying: “Should we have been? In a perfect world, sure, we should have been.”

Investigators were reviewing Ramos’ social media postings and searching his apartment, where Altomare said they found evidence of the planning Ramos had put into the attack. The chief would not give details.

Those killed included Rob Hiaasen, 59, the paper’s assistant managing editor and brother of novelist Carl Hiaasen. Also slain were editorial page editor Gerald Fischman, special projects editor Wendi Winters, reporter John McNamara and sales assistant Rebecca Smith.

The newspaper said two other employees were treated for minor injuries.

The city of Annapolis announced a vigil for the victims Friday night at a public square near the Capitol.

Contributors include Associated Press writers Eric Tucker, Michael Balsamo, Sarah Rankin and Denise Lavoie and the AP News Research Center in New York.