The incident occurred at the offices of the Capital Gazette, an Annapolis police spokesperson tells PEOPLE
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Five people were killed and multiple others were “gravely” injured Thursday when a gunman opened fire at the office of a newspaper in Annapolis, Maryland, authorities said at a press conference.

The shooting occurred at the offices of The Capital Gazette, an Annapolis police spokesperson tells PEOPLE.

Authorities said an estimated three people were injured and are being treated at a local hospital.

The lone suspect was identified only as a white male, and he is in custody, authorities said. He is not cooperating with investigators: He has refused to identify himself and has no identification on him, and police have no information about his motive.

Police were called at about 3:15 p.m.. They confronted the suspect within 60 to 90 seconds, authorities said, and apprehended the suspect without exchanging gunfire.

Authorities said the suspect used a “long gun.” Anne Arundel deputy police chief Bill Kramph said authorities recovered what they thought may have been explosive devices, but the devices were “taken care of” and that they “don’t anticipate having any more explosive devices.”

Phil Davis, a reporter with The Capital Gazette, wrote on Twitter, “Gunman shot through the glass door to the office and opened fire on multiple employees. Can’t say much more and don’t want to declare anyone dead, but it’s bad.”

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

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The Capital Gazette reported on the shooting in its offices. Davis is quoted as saying he and other employees hid under their desks during the shooting until the gunshots stopped.

“I don’t know why. I don’t know why he stopped,” Davis said, who added that police surrounded the shooter.

In news footage, people were seen evacuating the building with their hands up. Authorities said that about 170 people evacuated the building.

Speaking about the response by authorities, Annapolis Mayor Gavin Buckley said at a press conference, “If they were not there as quickly as they did, it could have been a lot worse.”

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Gov. Larry Hogan, on Twitter, wrote, “Absolutely devastated to learn of this tragedy in Annapolis.”

Following the shooting, the New York City Police Department and Los Angeles Police Department deployed counterterrorism teams and patrol units to local media organizations as a precaution, according to an NYPD advisory and the Los Angeles Times.

Annapolis is the capital of Maryland and the county seat of Anne Arundel County. Its population is about 40,000.