"She was in pure panic," he said.

Eventually Reid saw his wife near the shooting scene, escorted by Washoe County sheriff's deputies, he said.

Nevada state Sen. Debbie Smith, who was at the medical center campus when the shots erupted, was one of those kept under lockdown until police cleared the scene. "Everyone here at Renown is impatient about being on lockdown but I would rather be safe," she wrote on Twitter. "There are still SWAT members roaming the halls."

The campus was on lockdown all afternoon, but by 4:15 p.m., TV video showed hospital workers walking away.

Reno city spokeswoman Sharon Spangler said several witnesses had been taken to Reno police headquarters for questioning. "The police say they've entered the investigative phase of this incident," she said.

She added that officials had yet to notify relatives of the dead and injured and were not releasing identities. "What we do know is there are no more outstanding suspects," she said.

Robinson told reporters late Tuesday that the bodies were still where they fell. "They are in the middle of a crime scene," he said. "We're in the middle of an investigation, and we don't want to compromise that by rushing up to identify them."

Jan Tors, a spokesman for the University of Nevada, whose school of medicine has offices where the shooting occurred, issued a news release just after 4:30 p.m., saying all students and faculty members were safe.

"We are relieved to report [University of Nevada School of Medicine] officials have received confirmation that all UNSOM faculty and staff at that location are accounted for and safe," she wrote. "Reno Police Department and Renown Health have issued notices confirming the threat is clear."

Late in the day, Sen. Harry Reid (D-Nev.) reacted to the shooting on Twitter.

"Saddened by tragic shooting at Reno's Renown Regional Medical Center," he wrote. "My heart goes out to the victims and their families."