Global leaders call for unity in 2017

Millions of people around the globe have celebrated New Years Eve and welcomed in 2017. Image: Fireworks light up the sky over the London Eye in central London during the New Year celebrations (AAP/PA Wire)

Fireworks light up the sky over the London Eye in central London during the New Year celebrations Source: AAP/PA Wire

While the countdown brought parties and fireworks, it also came with heavy security and serious messages from world leaders.