Pupils may never return to Sandy Hook Elementary in Newtown, Conn., where 20 children were killed along with six teachers and administrators.

If officials do decide to reopen the school at all it could be months, State Police Lt. Paul Vance said, according to CBS.

“We are holding both crime scenes, the school and a secondary crime scene [Nancy Lanza's home] , indefinitely,” Vance said at a news conference Monday in Newtown. “I don’t know how long that will be – I am suspecting months.”

Instead the teachers and pupils will be moving to former school building that is 15 minutes away, according to various news reports.

Work crews went to the former Chalk Hill Middle School in Monroe on Sunday morning, so it would be ready for the children to resume classes, Monroe Police Lt. Brian McCauley reportedly said to USA Today.

The pupils will begin classes in a “matter of days” Monroe fire marshal William Davin said Monday to CBS News.

He said the children could return to school as early as Tuesday, but officials have yet to set a specific date.

When Chalk Hill reopens there will be police stationed at the school. The media will not be allowed to interview any of the children and only a single camera crew will be allowed to shoot video, McCauley said.

"We don't want to disrupt the students any more than they have been," he said, according to USA Today.

While it seems like “a matter of days” might seem too soon to send pupils back to class, Monroe Superintendent James Agostine said it’s essential they return to a familiar environment.

He said in a statement: "It is important that the Sandy Hook students get back to school quickly in an environment that is familiar and safe."

Before the shooting, 450 pupils attended Sandy Hook, USA Today said.