Republican presidential candidate Donald Trump has easily won theUS state of Nevada, cementing his lead in the race for the party's nomination.
The billionaire now has three caucus wins in a row, after victories in New Hampshire and South Carolina.
Senators Marco Rubio and Ted Cruz, who have been trading barbs this week, came second and third respectively.
Party officials said they were checking reports of double voting and insufficient ballots at one site.
Some volunteers also wore clothing in support of Mr Trump, but officials said this was not against the rules.
In his victory speech, Mr Trump told a roaring crowd: "We're winning, winning, winning the country, and soon the country is going to start winning, winning, winning."
He also celebrated getting the support of the "poorly educated" and Latinos. Some 45% of Nevada's Republican voters of Latino origin backed Mr Trump, according to entrance polls.