The contest in Iowa saw a tight race in the Democratic camp and an upset win in the Republican party. Here's a look at the drama from the first vote of the 2016 US presidential election.
Republican presidential candidate Senator Ted Cruz greets supporters after being declared the winner of the Iowa caucus on Feb 1, 2016. He upset party frontrunner Donald Trump.
PHOTO: BLOOMBERG
Republican presidential candidate Senator Ted Cruz embracing his wife Heidi in front of supporters at the caucus night gathering at the Iowa State Fairgrounds on Feb 1, 2016.
PHOTO: AFP
Former US President Bill Clinton pointing out a member of the crowd to his wife and Democratic presidential candidate Hillary Clinton during a caucus night party in Iowa on Feb 1, 2016. Mrs Clinton eked out the narrowest of wins over Senator Bernie Sanders of Vermont.
PHOTO: BLOOMBERG
Democratic presidential candidate Hillary Clinton, her husband Bill Clinton and their daughter Chelsea Clinton waving during a caucus night party in Iowa on Feb 1, 2016.
PHOTO: BLOOMBERG
Republican Presidential candidate Donald Trump speaking on stage as his wife Melania Trump looks on during a caucus watch party in Iowa on Feb 1, 2016.
PHOTO: BLOOMBERG
A young boy gives Republican presidential candidate Donald Trump a high-five at the Seven Flags Event Centre in Iowa on Feb 1, 2016.
PHOTO: REUTERS
Workers removing the podium of US Republican presidential candidate Donald Trump after his speech following the caucus results in Iowa on Feb 1, 2016.
PHOTO: EPA
Democratic presidential candidate Bernie Sanders posing for a selfie with a supporter during his caucus night rally in Iowa on Feb 1, 2016.
PHOTO: REUTERS
A supporter holding a caricature of Democratic presidential candidate Senator Bernie Sanders while waiting for him to speak during a caucus night party in Iowa on Feb 1, 2016.
PHOTO: BLOOMBERG
A supporter of Republican presidential candidate Senator Ted Cruz showing off his T-shirt while watching caucus results on television in Iowa on Feb 1, 2016.
PHOTO: BLOOMBERG
The stage is prepared for US Democratic presidential candidate Hillary Clinton at her caucus night rally in Des Moines, Iowa on Feb 1, 2016.
PHOTO: REUTERS