A day after the on-air killings of a reporter and cameraman shocked millions across the world, the grieving staff at WDBJ-TV came together for an emotional broadcast of its Mornin' show.

At 6.45am - the time of the shooting that took the lives of reporter Alison Parker and cameraman Adam Ward - the station observed a moment of silence, showing the victims' photos on the screen.

The shooting happened during a live TV interview as tens of thousands of viewers watched. Within hours, the carnage carried out by a disgruntled former colleague had spread to millions of viewers.

Shortly after the shooting, social media posts referencing the murdered pair surfaced on an account under an on-air pseudonym used by the gunman - culminating with a first-person video of the ambush filmed by the shooter.

Presenter Kim McBroom, who was on the anchor desk during the shooting and tried to reassure viewers immediately after the attack was broadcast, joined hands with weatherman Leo Hirsbrunner and fellow host Steve Grant, who came in from sister station KYTV in Springfield, Missouri.

During his forecast, Mr Hirsbrunner's voice trembled as he recalled how Mr Ward would check in with him every morning about the weather before going out on assignment.

"I don't even know how to do weather on a day like this," he said. Ms McBroom told him: "Good job, partner. We're going to get through this together."

The morning broadcast included a series of news pieces on the shooting. One looked at the criminal investigation of gunman Vester Lee Flanagan II, the former WDBJ-TV reporter known to viewers by his on-air name Bryce Williams. He died of a self-inflicted gunshot wound hours after the shooting.

His family released a statement expressing condolences for the victims' families and asking for privacy: "Words cannot express the hurt we feel," it read.

The social media post made through an account under the Bryce Williams name had a 56-second video clip. It shows Flanagan quietly approach Ms Parker and Mr Ward, gun in hand, as they conduct an interview. Then he fired eight shots without saying a word.

The attack seemed carefully planned. Flanagan was captured in a rental car he reserved at some point before the shootings; his own Mustang was found abandoned at the local airport.

The interview was done at a shopping centre not yet open for the day at a remote lake in Moneta, some 25 miles away from WDBJ's studios in Roanoke. The station publicised where the reporter would be, including an update on Twitter just 30 minutes before the shooting.

About three hours after the killing, ABC News reported it received a 23-page faxed statement from someone named Bryce Williams.

Flanagan was known to the pair. The 41-year-old had been fired by the station in 2013 and had to be escorted out of the building, according to the station's president and general manager Jeffrey Marks.

On Twitter, Flanagan described workplace conflicts with both of his victims. He said Ms Parker had made racist comments and that she was still hired after he filed a complaint with the Equal Employment Opportunity Commission (EEOC). He said Mr Ward had reported him to human resources.