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A man killed his mother at their home and then opened fire Friday inside an elementary school, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom.

The 20-year-old killer, carrying at least two handguns, committed suicide at the school, bringing the death toll to 28, authorities said.

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The rampage, coming less than two weeks before Christmas, was the nation’s second-deadliest school shooting, exceeded only by the Virginia Tech massacre that claimed 33 lives in 2007.

“Our hearts are broken today,” a tearful President Barack Obama, struggling to maintain his composure, said at the White House. He called for “meaningful action” to prevent such shootings, saying, “As a country, we have been through this too many times.”

Police shed no light on the motive for the attack. The gunman, Adam Lanza, was believed to suffer from a personality disorder and lived with his mother, said a law enforcement official who was briefed on the investigation but was not authorized to discuss it.