NEWTOWN, Conn. (AP) – He spoke for a nation in sorrow, but the slaughter of all those little boys and girls left President Barack Obama, like so many others, reaching for words. Alone on a spare stage after the worst single day of his presidency, the commander in chief was a parent in grief.

“I am very mindful that mere words cannot match the depth of your sorrow, nor can they heal your wounded hearts,” Obama said at an evening vigil Sunday in the grieving community of Newtown, Conn. “I can only hope that it helps for you to know that you are not alone in your grief.”

The massacre of 26 children and adults at Sandy Hook Elementary on Friday elicited horror around the world, soul-searching in the United States, fresh political debate about gun control and questions about the incomprehensible — what drove the suspect to act.