A man armed with a shotgun and smoke grenades stormed into the newsroom of a community newspaper chain in Maryland’s capital on Thursday afternoon, killing five staff members, injuring two others and prompting law enforcement agencies across the country to provide protection at the headquarters of media organizations.

The suspect, Jarrod W. Ramos, 38, was taken into custody at the scene and was charged on Friday morning with five counts of first-degree murder. He had a long history of conflict with the Capital Gazette, which produces a number of local newspapers along Maryland’s shore, suing journalists there for defamation and waging a social media campaign against them.

“This was a targeted attack on the Capital Gazette,” said William Krampf, acting chief of the Anne Arundel County Police Department. “This person was prepared to shoot people. His intent was to cause harm.”

A bail hearing for Mr. Ramos was scheduled for 10:30 a.m. Friday in Annapolis, according to Maryland court records, which did not list a lawyer for him but said Mr. Ramos was eligible to be represented by a public defender.

The chilling attack was covered in real time by some of the journalists who found themselves under siege. A summer intern, Anthony Messenger, tweeted out the address of the office building where the newsroom is based, saying, “please help us.” A crime reporter, Phil Davis, described how the gunman “shot through the glass door to the office” before opening fire on employees.

“There is nothing more terrifying than hearing multiple people get shot while you’re under your desk and then hear the gunman reload,” Mr. Davis wrote.

Even as the authorities continued to pore over the newsroom for clues, the Capital Gazette announced Thursday that it would be publishing an edition on Friday.

Shortly after 9 p.m., several tired reporters and a photographer from the Capital Gazette were filing stories and photographs from their laptops, set up in the back of a silver pickup truck in the parking lot of the Westfield Annapolis Mall, across the street from their newsroom.

E. B. Furgurson III, a reporter, stood in a blue shirt and khaki pants with his colleagues. He had decided to go get lunch around the time the shooting happened, so he was not in the building at the time.

When asked if they were putting out a paper on Friday, he said fiercely: “Hell, yes.”

His colleague Joshua McKerrow, a photographer, said he was going to pick his daughter up for her birthday when he was called about the shooting. He rushed back. He had a hard time finishing sentences.

“Our newspaper is one of the oldest newspapers in the U.S.,” he said. “It’s a real newspaper and like every newspaper, it is a family.” He began to cry. Then he added:

“We will be here tomorrow. We are not going anywhere.”