New York Governor Andrew Cuomo, New Jersey Governor Chris Christie and Connecticut Governor Dan Malloy tweeted:
Gov: I join with my fellow NYers in mourning the loss of innocent lives that were taken in today’s shooting | #NYS flags @ half-staff tom
In recognition & mourning of the victims in NewtownCT today, I am ordering flags to be flown half-staff on Tuesday Dec18 2012#PrayForNewtown
More top news
Patchy rain affects northern areas of the UK in the next 24 hours. Elsewhere, dry but rather cloudy.
Marjorie and Micheal Cawdery, both 83, were found dead in their house in Portadown, Northern Ireland on Friday.
Ann Myatt, who is contesting Jo Cox's former seat, told a hustings: "We've not yet shot anybody so that's wonderful."