Two adult survivors who were shot and injured in the Newtown, Conn., school massacre will be integral parts of the investigation into the deadly rampage, police said today.
"Investigators will, in fact, speak with them when it's medically appropriate and they will shed a great deal of light on the facts and circumstances of this tragic investigation," Connecticut State Police Lt. Paul Vance said at a news conference today.
Both survivors are recovering from gunshot wounds in the hospital, police said. Authorities had previously mentioned one adult survivor. The adults have not been identified and police did not give details on their condition.
READ MORE: School nurse hid from gunman.
Both adults, Vance said, were wounded in the "lower extremities," but did not indicate where in the building they were when they were injured.
Moving trucks were seen outside Sandy Hook Elementary School this morning, as school officials prepare to move furniture and supplies to a vacant school in enighboring Monroe.
Sandy Hook itself will remain a secure crime scene "indefinitely," said Vance.
CLICK HERE for complete coverage of the tragedy at Sandy Hook.
Police say Adam Lanza, 20, forced his way into Sandy Hook Elementary School on Friday, spraying bullets on students and faculty. Lanza killed 20 children and six adults before turning the gun on himself.
Calls for Gun Control Surge Following Newtown Shootings Watch Video
Newtown School Shooting: Social Media Reaction Watch Video
Newtown School Shooting: Talking to Kids About Tragedy Watch Video
Lanza also killed his mother Nancy Lanza at the home they shared before going to school.
"There are many, many witnesses that need to be interviewed," Vance said. "We will not stop until we have interviewed every last one of them."
Vance said the investigation could take weeks or months to complete. "It's not something done in 60 minutes like you see on T.V."
Some of the other key witnesses will be children who survived the shooting spree by playing dead, hiding in closets and bathrooms and being rescued by dedicated teachers.
"Any interviews with any children will be done with professionals...as appropriate," Vance said. "We'll handle that extremely delicately when the time arises."
CLICK HERE for a tribute to the shooting victims.
The first funerals for victims of the shooting are today, beginning with 6-year-olds Noah Pozner and Jack Pinto.
Officials said today that the Sandy Hook Elementary School, where the shooting took place, will be closed "indefinitely."
Both the school and the home where shootings took place are being held by police as crime scenes and Vance predicted authorities would spend "months" investigating the elementary school.
All Newtown schools are closed today to give residents more time to cope. Every school except for Sandy Hook is expected to re-open Tuesday.
The town of Monroe has offered to open Chalk Hill School, which is not currently being used, to Sandy Hill students and staff, the Newtown Board of Education said in a statement.
The neighboring community's school is expected to be ready to accommodate students in the next few days, though an exact schedule has not yet been published.
While the families grieve, federal and state authorities are working around the clock to answer the question on so many minds: "Why?"
ABC News has learned that investigators have seized computers belonging to Adam Lanza from the home he shared with his mother. Three weapons were found at the school scene and a fourth was recovered from Lanza's car. Lanza had hundreds of rounds and used multiple high-capacity magazines when he went on the rampage, according to Connecticut State Police.
Vance said that every single electronic device, weapon and round will be thoroughly examined and investigated as well as every aspect of Lanza's life going "back to the date of birth."
ABC News has learned that both the shooter and his mother spent time at an area gun range; however it was not yet known whether they had shot there.