A day after a Virginia Beach city employee killed 12 people — including colleagues — in a shooting rampage in the municipal building where he worked, investigators are scrambling to nail down why it happened, officials said Saturday.
"It's still a sense of shock, disbelief. Why did this happen?" Bobby Dyer, mayor of the coastal Virginia city, told CNN, standing across the street from the multistory brick building where the massacre happened.
"I guess the big question is why. We want to know, too."
Authorities said DeWayne Craddock, 40, a certified professional engineer in the city's public utilities department, opened fire on all three floors of Building 2 of the Virginia Beach Municipal Center at the end of Friday's workday.
Craddock killed a dozen people and injured others, and sent terrified witnesses running out of the building or hiding under desks before dying at the end of a lengthy gunbattle there with four police officers, authorities said.
Eleven of the 12 killed were city employees. The other was a contractor who was there to fill a permit, City Manager Dave Hansen said.
Officials are now left not only answering questions about what happened but also dealing with the deaths of their colleagues. Hansen said he'd worked with many of them for years, and served with one in the US military in Germany. Dyer said the contractor was a friend of his who'd done carpentry work at his home.
"They leave a void that we will never be able to fill," Hansen said Saturday before he read the victims' names.
Four others in the shooting were hospitalized, police said. They had surgery Friday night, and three are in critical condition, while one is in fair condition, hospital officials said. An officer was shot in the gunfight but survived because of his ballistic vest, police Chief James Cervera said.
Friday's massacre is the deadliest in the United States this year and adds the Virginia city to a grim list of places affected by a mass shooting.
Gunman fired through all floors except the basement, officials say
Officials said Saturday they were either searching for answers, or unwilling to reveal details, about what spurred the shooting.
A Virginia government source briefed on the investigation told CNN the shooter was a "disgruntled employee."
Craddock was a certified professional engineer in the city's public utilities department. He is listed on department news releases as a point of contact for information on local road projects over the past several years.
Cervera, the police chief, said his investigators still don't know the shooter's motive. He and Hansen declined to answer questions Saturday about whether Craddock had threatened anyone in the building previously or faced discipline at work.
The gunfire started at the end of the workday while people still were visiting the municipal center for business. He fired through on every floor except the basement as he moved through the building, officials said.
Officers gave the shooter first aid
Four officers confronted the shooter inside the building in what the chief called a "long gunbattle."
Two veteran detectives and two K-9 officers entered the building and began a shootout with the suspect. Cervera said they helped stop him from committing more carnage.
The gunman was wounded, and officers tried to save him, the chief said.
"Even though he was involved in a long-term gunbattle with these officers when he went down, they did what cops do and they rendered first aid to this individual," Cervera said Friday.
The chief said that a .45-caliber pistol, a suppressor and several empty, higher-capacity magazines were found near the shooter.
Investigators have found "additional weapons" at the gunman's home, the chief said.
He was thought to have purchased the firearms legally, according to initial information investigators have, a law enforcement official said.
Co-worker describes encounter with Craddock earlier in the day
Sometime before the shooting Friday, a co-worker of Craddock's had a final exchange with him that amounted to "have a good weekend," the colleague said.
Joseph Scott, who said he worked with Craddock for several years, saw him in a bathroom at work Friday.
"He was at the sink, brushing his teeth like he always did," Scott told CNN. "I used the bathroom and walked up and was washing my hands, and I said, 'How are you doing?' He said he was doing OK.
"I asked, 'Any plans for the weekend?' And he said, 'No.' And I said, 'Well, have a good day,' and he said the same to me.
"And it was no more than that."
Scott said Craddock was "what I thought was a good person," and described him as generally quiet.
"When we were together, we would talk about family, friends, things that we were going to do, trips we were going to take and things like that," Scott said.
Many victims were longtime workers for the city
Hansen said the 11 slain city employees had worked for Virginia Beach for times ranging from 11 months to 41 years.
They were Virginia Beach residents Tara Welch Gallagher, Mary Louise Gayle, Alexander Mikhail Gusev, Katherine A. Nixon, Ryan Keith Cox, Joshua A. Hardy, Michelle "Missy" Langer; Chesapeake residents Laquita C. Brown and Robert "Bobby" Williams; Norfolk resident Richard H. Nettleton; and Powhatan resident Christopher Kelly Rapp.
Also killed was the contractor, Herbert "Bert" Snelling, of Virginia Beach.
Nettleton, an engineer with the city's public utilities department, "served with me as a lieutenant in Germany in the 130th Engineer Brigade," said Hansen, the city manager.
Lawmakers and activists respond
David Hogg, who survived the Parkland, Florida, school massacre, responded to the latest mass shooting with a short tweet: "How many more."
Local and federal lawmakers also expressed their dismay.
"This is the most devastating day in the history of Virginia Beach," said Dyer, the city's mayor. "The people involved are our friends, co-workers, neighbors, colleagues."
The city will help them go through the healing process, he said.
"We're going to move forward as a city, as a community. We're going to be there for the families," the mayor said. "The people that were victims of this tragic event, they were family members, they were co-workers, they were a vital part of the community of Virginia Beach, and they will not be forgotten."
Gov. Ralph Northam ordered all Virginia flags to be lowered to half-staff across the state until sunset on June 8 in memory of the victims, according to the Virginia Capitol Police .
In his first public comments on the shooting Saturday, President Donald Trump said he had called Northam and Virginia Beach's mayor and vice mayor to offer condolences.
"The Federal Government is there, and will be, for whatever they may need. God bless the families and all!" Trump said in a tweet .