Trump and Clinton big winners on Super Tuesday
Video report by ITV News Washington Correspondent Robert Moore
Hillary Clinton and Donald Trump scored the biggest victories on "Super Tuesday" - each winning seven of 11 state nominations for their parties on a night viewed as a major indicator of the shape of the presidential race.
On the biggest single day of voting in the US, Trump emerged as the clear frontrunner for the Republicans, with closest rival Ted Cruz taking just three states.
Meanwhile Clinton polled strongly for the Democrats, with opponent Bernie Sanders claiming the biggest of three wins in his home state Vermont.
Trump: 'I'm a unifier'
Trump described Tuesday as a great night, while congratulating the other Republican candidates in an unusual show of modesty.
He said that Clinton had failed in her four years as Secretary of State and that it would be a sad day if she won the Democratic nomination - even vowing to "go after her".
Labelling himself a "unifier", Trump listed America's "depleted" military as among the countries biggest problems, but promised to make it "bigger, better and stronger" than ever before.
He also took to Twitter to repeatedly thank supporters for helping him "make America great again."
Ted Cruz polled biggest in Oklahoma, Alaska and his home state Texas, while Florida's Marco Rubio won his first state, Minnesota.
Cruz claimed his victories showed he was the only candidate capable of taking on Trump, and asked the remaining Republican runners to quit the race in order to unite against the businessman.
Hillary Clinton: 'We are going to break down barriers'
Clinton told supporters America needs "more love and kindness" for the country to prosper, while she vowed to break down barriers - a direct reference to Trump's pledge to build a wall across the Mexican border.
She said that America is only strong or prosperous when the whole country is strong and prosperous, adding that the it belongs to "all of us" and "not just those at the top."
Democratic rival Bernie Sanders took Colorado, Minnesota, Oklahoma and Vermont in the primary polls.
He refused to accept the Democratic race is over despite Clinton's gains, repeating: "By the end of tonight, we are going to win many hundreds of delegates."
Sanders currently stands over 700 delegates short of Clinton.
Analysis: 'Important, but not decisive'
ITV's Washington Correspondent Robert Moore says that although Super Tuesday's results are important, they are not decisive.
Why does Super Tuesday matter?
Super Tuesday is an important day because it allocates nearly a quarter of the 2,472 Republican delegates and some 20% of all delegates for the Democrats.
On 8 November, America is due to elect a successor to Barack Obama, who will step down after two terms in office which have seen the Republicans take control of both houses of Congress.
While supporters of Bernie Sanders hope the race for the Democratic nomination is not over, Ted Cruz urged other Republicans to quit the race and unite with him against Trump.
Concerns remain over Trump candidacy
While Trump swept to victory in Tuesday's primary polls, some Hispanic Americans have voiced their fears over the billionaire's pledges should be win the Presidency.
Some have revealed how the "joke" prospect of Trump reaching the White House is now turning into a "scary" reality, describing his policies as a threat.
Meanwhile a group of black students told ITV News they were ejected from a Trump rally at a Georgia university on racial grounds.
The Valdosta State University students claim they were asked to leave by security staff who told them the rally was a "private event".
The Trump campaign denied students had been shown the door at the request of the candidate.