Barack Obama has tweeted on the White House's official Twitter account:
20 beautiful children & 6 remarkable adults. Together, we will carry on & make our country worthy of their memory. -bo #MomentForSandyHook
More top news
Theresa May will vow to never let the UK become "looser and weaker" in a speech ahead of her meeting in Scotland with Nicola Sturgeon.
Just how does the power-sharing system in Northern Ireland work, and what happens now that talks are at "the end of the road"?
Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.