NEWTOWN, Conn. — Sandy Hook Elementary School, the site of the second deadliest mass shooting in U.S. history, will remain closed for the next several months, police said early Monday, and school officials don’t know if it will ever open again.

Public schools across Newtown plan to reopen their doors Tuesday, local authorities indicated, but police are holding Sandy Hooks as a crime scene “indefinitely,” said Lt. Paul Vance of the Connecticut State Police.