The president and his wife, Michelle, have two daughters.
"Michelle and I will do what I know every parent in America will do, which is hug our children a little tighter," he said. "But there are families in Connecticut who cannot do that tonight, and they need all us of right now."
The president pledged support to Connecticut Gov. Dannel P. Malloy.
Said Obama: "He will have every single resource that he needs to investigate this heinous crime."
Associated Press writer Matthew Daly contributed to this report.
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