UPDATE: Capital Gazette shooter filed defamation lawsuit in 2012

The Anne Arundel County Police Department has not identified the alleged shooter, but law enforcement sources told ABC News his name is Jarrod Warren Ramos.

Ramos is due for a bail hearing at 10:30 a.m. Friday at Annapolis District Courthouse and he has been charged with five counts of first-degree murder.

Court records show that in July 2012, Ramos filed a complaint against the newspaper, alleging he was defamed by a story written by a Capital Gazette reporter. He soon after filed a defamation lawsuit, and lost. 

He since then made threats on social media against that reporter and the paper; threats police were aware of and monitoring. 

Five people are dead and several others are hospitalized after a shooting at the Capital Gazette newspaper in Annapolis, Maryland, police said.

One suspect engaged with responding officers within about 1 minute and taken into custody, officials said.

A city spokesperson said one shooter is now in custody and is currently being interrogated.

Police said there are no other shooters.

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An active shooter was reported at the Capital Gazette, a daily newspaper in Annapolis, Maryland, on Thursday, said the Anne Arundel Police and ATF.

A Gazette reporter said multiple people were shot, according to The Baltimore Sun, which owns the Gazette.

First responders gather after reports of a shooting in the offices of the Capital Gazette in Annapolis, Md., June 28, 2018.

The building was evacuated, according to the Annapolis Office of Emergency Management.

Police cars have swarmed the scene and people were seen streaming out of the building with their hands up.

Officers are working to search the building, said Lt. Ryan Frashure of the Anne Arundel Police.

"We’re doing the best we can to minimize causalities," Frashure said

"Absolutely devastated to learn of this tragedy in Annapolis," Gov. Larry Hogan wrote on Twitter. "Please, heed all warnings and stay away from the area. Praying for those at the scene and for our community."

President Trump has been briefed on the shooting, said White House deputy press secretary Lindsay Walters.

"Our thoughts and prayers are with all that are affected," Walters said.

Additional details were not immediately available.

This story is developing. Please check back for more updates.