The United States, Russia and other members of the International Syria Support Group have agreed a deal that will aim for a cessation of hostilities next week.
Airstrikes on UN designated terror organisations, such as ISIS and Al Nusra, will continue under the agreement.
The delivery of urgently needed humanitarian aid to besieged areas will begin immediately.
Outsiders deliver on poll numbers to stun party establishment
How the candidates reacted
Other headlines from New Hampshire
- Carly Fiorina dropped out after finishing third last in New Hampshire with 4.1% (11,706 votes). Ms. Fiorina had 1.9%
Governor Chris Christie also dropped out having finished 6th in New Hampshire with 7.4% (21,069 votes).
- The Walt Disney Company had a stellar quarter in the three months to January 2nd, posting record revenues of $15.2 billion (+14%) driven by what the company called the 'phenomenal success' of Star Wars.
The Force Awakens helped boost studio earnings by 86% to $1.01 billion.
The positive Star Wars news was overshadowed by a 6% decline in earnings at Disney's media networks, ABC and ESPN.
Shareholders are concerned about the impact of 'cord cutting', where pay TV subscribers ditch their expensive monthly contracts in favour of less expensive streaming alternatives, on ESPN's profits.
What is at stake?
24 Democratic delegates
23 Republican delegates
When do polls open and close?
Voting is underway in most districts now and will conclude in most areas by 7pm local (midnight GMT).
The state of the race
Republicans: Donald Trump has been leading polls in New Hampshire for months and is widely expected to win the state. Doing so would be a boost to Mr. Trump after his disappointing second place showing in Iowa.
Election watchers will also have a close eye on Senator Marco Rubio's placing following his strong showing in Iowa and his lacklustre performance in Saturday's debate. Former Florida governor Jeb Bush is in dire need of a solid result to breathe some life into his floundering campaign.
Dropped out after Iowa: Mike Huckabee, Rick Santorum, Rand Paul.
Democrats: Bernie Sanders is the strong favourite according to opinion polls and the senator will be hoping to capitalise on the momentum he garnered from the virtual tie between himself and Hillary Clinton in Iowa.
Since Iowa, the vitriol between the two campaigns has intensified with Clinton and Sanders sparring over whom is the more progressive. In last week's debate, Mrs. Clinton accused Senator Sanders of engaging in a 'very artful smear' against her reputation.
Dropped out after Iowa: Martin O'Malley.
What comes next?
Nevada Democratic caucus, South Carolina Republican primary.
Nevada Republican caucus.
South Carolina Democratic primary.
March 1st - Super Tuesday
A new UN report alleges that all sides in the Syrian conflict, including the government, armed opposition groups, ISIS and Al Nusra, have committed crimes against humanity through their treatment and killing of detainees.