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
A 95-year-old man has beaten a care home resident to death with a zimmer frame, officials say.
Tony Blair is to take on a new role tackling anti-Semitism after stepping down as Middle East envoy.
Dramatic footage has captured the moment a police officer pulled a man from a burning car.