A Connecticut state police lieutenant said that the gunman in the mass shooting at the Sandy Hook Elementary School in Newtown, Conn., was not voluntarily allowed into the school but forced his way in.

"He was not voluntarily let into the school at all," Lt. J. Paul Vance of the Connecticut State Police told Wall Street Journal reporters Saturday morning, "He did force his way into the school."

That detail helped solve one of the many unanswered questions about the tragedy: How a heavily armed young man was able to pass through the locked security doors of an elementary school.

"It appears that he shattered the glass adjacent to the doors to enter the building," Lt. George Sinko of the Newtown police said in an appearance on NBC's Today show. "It's one of the things we're still looking into."

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Hoboken neighborhood rocked by massacre connection

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Official: Gunman's Brother in New Jersey Cooperating

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President Obama spoke of the Newtown school shootings Saturday in his weekly address.

“Our hearts are broken today, we grieve for the families of those we lost and we keep in our prayers the parents of those who survived because as blessed as they are to have their children home, they know that their child’s innocence has been torn away far too early,” the president said, adding that the nation has “endured far too many of these tragedies.”

“We have to come together and we’re going to have to take meaningful action to prevent more tragedies from happening regardless of politics.”