4 People Killed in Shooting at Local Newspaper Building in Maryland, Suspect in Custody

In this frame from video, people leave the Capital Gazette newspaper after multiple people have been shot on Thursday, June 28, 2018, in Annapolis, Md. (WJLA via AP)

Four people were killed Thursday in a shooting at a local newspaper building in Maryland, a senior federal law enforcement source tells CBS News. One suspect is in custody.

The shooting at the Capital Gazette newspaper prompted a massive police response, with employees evacuated from the building with hands raised above their heads. The Gazette is a local newspaper owned by The Baltimore Sun.

Phil Davis, a Gazette reporter, tweeted that he was in the building when the shooting happened. Davis said via Twitter the gunman shot through the glass door to the office and opened fire on multiple employees.

White House spokeswoman Lindsay Walters says President Trump has been briefed on the shooting and “our thoughts and prayers are with all that are affected.” Officials said the Bureau of Alcohol, Tobacco, Firearms and Explosives were responding to the scene.