MARYLAND, United States (AFP) — At least five people were killed Thursday when a gunman opened fire inside the offices of the Capital Gazette, a newspaper published in Annapolis, a historic city an hour east of Washington.

A reporter for the daily, Phil Davis, tweeted that a “gunman shot through the glass door to the office and opened fire on multiple employees.”

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

“There’s five fatalities that we know of. There’s several other persons that are gravely injured,” acting police chief of Anne Arundel county Bill Krampf told a news conference in the city, capital of the state of Maryland.

Steve Schuhn, county executive, said a suspect was in custody and was being interviewed by detectives.

Lieutenant Ryan Frashure, a police spokesman, earlier told reporters police were “making sure there’s no other people that are suspects or helped the individual” and were combing the four-story office building for bombs.

“We’re doing our very best to get the building secure,” he added.

President Donald Trump was briefed on the incident and tweeted a message of support.

“My thoughts and prayers are with the victims and their families. Thank you to all of the First Responders who are currently on the scene,” he wrote.

“Absolutely devastated to learn of this tragedy in Annapolis,” Maryland Governor Larry Hogan said. “Please, heed all warnings and stay away from the area. Praying for those at the scene and for our community.”