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
Tackling the effects of the emerging drug has been described as one of the 'biggest challenges in policing' for 30 years.
A 16-year-old boy has been arrested on suspicion of terror offences as he prepared to leave the UK.
An man is reported to have wounded at least five people - two seriously - in an attack in the Swiss town of Schaffhausen.