A man has been arrested in connection with death threats made to Boston Globe employees, officials said.

The Globe received a bomb threat and threats directed toward staffers after it led a nationwide effort for newspapers to condemn President Donald Trump's attacks on the media.

"A central pillar of President Trump's politics is a sustained assault on the free press," the editorial began. "Journalists are not classified as fellow Americans, but rather 'the enemy of the people.' This relentless assault on the free press has dangerous consequences. We asked editorial boards from around the country - liberal and conservative, large and small - to join us today to address this fundamental threat in their own words."

The editorial was published in print on Aug. 16, six days after it called on other publications to denounce the attacks.

Robert D. Chain, a 68-year-old from California, began calling the Globe the day of the announcement, according to U.S. Attorney Andrew Lelling's office.

Chain continued to call employees of the newspaper, threatening to kill them for more than a week, prosecutors said, placing 14 threatening phone calls to Globe employees.

His communication was reported to Boston police after he threatened to shoot employees in the head "later today, at 4 o'clock" on the day the editorial was published, the U.S. Attorney's office said.

During that call, he allegedly said, "You're the enemy of the people, and we're going to kill every [expletive] one of you. Hey, why don't you call the F, why don't you call Mueller, maybe he can help you out buddy," according to the affidavit. "What are you going to do [expletive]? You ain't going to do [expletive]. I'm going to shoot you in the [expletive] head later today, at 4 o'clock. Goodbye."

An owner of several weapons, prosecutors say he bought a new 9mm carbine rifle in May.

Chain was charged with one count of making threatening communications in interstate commerce. He is scheduled to appear in federal court in Los Angeles Thursday afternoon and be transported to Massachusetts at a later date.