Investigators have identified a man suspected of shooting and killing a security officer Friday at New Hampshire Hospital and released autopsy results for both men.Attorney General John Formella said John Madore, 33, shot and killed Bradley Haas, 63, of Franklin, who previously served as chief of police in Franklin and was working as a security officer for the hospital.Formella said a New Hampshire state trooper quickly responded to the report of a shooting and shot and killed Madore. The trooper's name has not been released as the investigation continues.According to the autopsy report released Saturday evening, officials confirmed multiple gunshot wounds was the cause of Haas's death. Officials also said Madore's cause of death was due to multiple gunshot wounds. Both have been ruled homicides. "Without the actions of Bradley Haas and without the actions of the trooper on scene, this could have been a lot worse," Formella said.>> Call center for families of New Hampshire Hospital patients: 603-271-3004Formella said Madore did not get past the metal detectors in the lobby of the hospital, which is a secure inpatient psychiatric facility.Police are also continuing to investigate a U-Haul truck that was found running in the parking lot after the shooting. State Police Col. Mark Hall said an AR-15-style weapon, a tactical vest and ammunition were found in the truck. >> Download the free WMUR app to get updates on the go: Apple | Google Play << Hall said Madore used a 9 mm handgun to shoot Haas. Police are still investigating any links Madore might have had to the truck.Formella said Haas was not armed in his role as a security officer for the hospital. He said it would not be typical for a security guard in that role to be armed. Madore was described as a transient person who recently stayed in a hotel in the Seacoast area and also spent time in the Concord area. Formella said investigators are still looking into whether he had any ties to the hospital or to Haas.>> LISTEN: Dispatch audio from first moments of New Hampshire Hospital shooting No possible motive in the attack has been released. No patients at the hospital were injured, Hall said. A call center — which can be reached by calling 603-271-3004 — has been established by the state Department of Health and Human Services for family members of patients at New Hampshire Hospital. The call center will remain open until further notice, officials said.>> Video: Workers, residents shaken by shooting at New Hampshire HospitalPolice received calls about an active shooter at about 3:40 p.m. A state trooper working in the hospital at the time reported that shots were fired in the lobby.A police academy graduation happened nearby as officers rushed to the scene."There was a very quick response other than the trooper being on scene when the incident happened. Additional troopers are here within minutes," Hall said.Several employees of the hospital heard the shots and locked themselves in closets, sources told News 9.>> Hear reaction from people near the scene:A worker who was inside the hospital who did not want to be identified told News 9 that they were leaving for the day and were in the lobby when police in tactical gear told them to get back. The worker ran back to their office and hid under their desk.As hospital workers were led from the building, some could be seen crying and hugging each other.>> Related: What to know about New Hampshire Hospital, its campus "Valerie and I extend our sincere condolences to the family of Department of Safety Security Officer Bradley Haas of Franklin, NH, who gave his life today protecting the patients and staff at New Hampshire Hospital. He will be remembered for his heroism and decades of public service," Gov. Chris Sununu said.>> Full video: News conference on New Hampshire Hospital shooting New Hampshire Hospital is a secure, inpatient psychiatric hospital, and all visitors must go through metal detectors. A police officer is always on duty. There are 184 staffed psychiatric beds in the facility.The hospital is on a 120-acre campus that's home to many large state agencies, including the Department of Health and Human Services, the Department of Education, the Public Utility Commission and others.