The race for the Republican presidential nomination continues after Donald Trump won a decisive victory in the key state of Florida but lost to John Kasich in Ohio.
Democratic front-runner Hillary Clinton extended her lead with wins projected in Florida, Ohio and North Carolina.
Meanwhile Marco Rubio dropped out of the Republican race after losing in his home state of Florida to Mr Trump.
The billionaire is also set to win in Illinois and North Carolina.
Five big states have been choosing their preferred candidate for November’s presidential election.
“We have to bring our party together,” Mr Trump said in Palm Beach, Florida, as the results came in on Tuesday evening.
He was hoping the votes would give him a clear path to becoming the Republican choice for the White House.
However, John Kasich secured his first win in the Republican contest in the state of Ohio where he is governor.
At the Trump victory speech
And then there were three. After Senator Marco Rubio’s crushing defeat in his home state of Florida at the hands of Donald Trump, he had little option but to end his campaign for the presidency. At the Mar-a-Lago, Mr Trump’s sumptuous gilded palace-cum-private members’ club in Palm Beach, this was cause for big celebration.
He didn’t just win. He won big. And he won in three other states too. But perhaps unusually – even uniquely – for a man who has totally dictated the media narrative since he convulsed the Republican race by entering the fray last June, the focus might just be on the state that he lost, rather than the states he won.
For John Kasich’s victory means that the battle for the Republican nomination not only goes on, it could go all the way to the convention in July. And in the Donald J Trump ballroom (what else was it going to be called?) Mr Trump gave a victory speech that sounded anything but victorious. It was low key, understated – and he had the air of a man who was weary of the punishing campaign schedule.
Two weeks ago after Super Tuesday he seemed much more confident of winning the Republican nomination than he did tonight. And tellingly, while he was magnanimous in victory by praising Marco Rubio for running a tough campaign and talking about his bright future, Governor John Kasich didn’t get a single mention. As if defeat in Ohio hadn’t happened.
Maybe it was an oversight – or maybe the Teflon man has found politics suddenly getting a lot more sticky.
In his victory speech, Mr Kasich said he wanted to create a “climate of opportunity” for future generations and praised the campaign of Marco Rubio.
Earlier Mr Rubio announced he was suspending his campaign on stage in Miami.
He said the US was in the middle of a “political storm”, and voters were angry and frustrated.
In the same city, Mrs Clinton gave an upbeat victory speech in which she chastised Mr Trump and said “Americans were hungry for solutions”.
She listed student debt, affordable childcare and inequality as issues she pledged to address.
Her challenger, Vermont Senator Bernie Sanders, assured his supporters in Phoenix, Arizona, that he would stay firmly in the race, and said his campaign had already “defied expectations”.
Florida and Ohio are particularly important in the race for the Republican nomination because the winning candidate gets all of the delegates on offer – 99 in Florida and 66 in Ohio.
Those delegates go to the national convention in July where the presidential nominee will be chosen.
For the Democratic nomination, Florida offers the greatest number of delegates – to be distributed proportionally – with 246. Meanwhile Illinois offers 156 delegates and Ohio 143.
Opinion polls had given Mrs Clinton a comfortable lead over her Mr Sanders especially in Florida and North Carolina. But Mr Sanders appeared to be gaining ground in the three other states.
Mr Sanders pulled off a major political upset with his win in Michigan a week ago.
Meanwhile Mr Trump has come under fire from both Democrats and Republicans after a string of violent incidents at his rallies.
His critics say his hard line on Muslims and immigrants, and inflammatory comments made about protesters at his rallies, have encouraged the violence and an atmosphere of hate.
But the hotel tycoon has rejected the accusations and called himself a “uniter”.
President Barack Obama said he had been dismayed by events on the campaign trail and said he rejected “any effort to spread fear or encourage violence”.