Speaking at a vigil in Newtown, the US President Barack Obama said they were not along in their grief.
"We gather here in memory of 20 beautiful children and six remarkable adults. They lost their lives in a school - that could have been any school - in quiet town full of good and decent people. That could be any town in America. Here in Newtown I come to offer the love and prayers of a nation.
I am mindful there mere words cannot match the depth of your sorrow. Nor can they heal your wounded hearts. I can only hope it helps for you to know that you're not alone in your grief - but our world too has been torn apart. All across this land of ours, we have wept with you."
More top news
Jihadis turn to groups like IS because they're 'not making it with girls so turn to other forms of spiritual comfort', Boris Johnson claims
Actor Robbie Coltrane was admitted to hospital last night while on a flight from London to Orlando.
Justin Bieber has posted a video online apologising for his "arrogant" and "conceited" behaviour in the past year.