U.S. Republican front-runner Donald Trump and Democratic favorite Hillary Clinton swept to victory in Arizona on Tuesday in contests that were overshadowed by deadly attacks in Brussels that raised security concerns in the United States.
Trump, who has riled establishment Republicans, easily defeated his two rivals for the Republican presidential nomination, U.S. Senator Ted Cruz of Texas and Ohio Governor John Kasich, U.S. television networks projected.
On the Democratic side, Clinton stretched her advantage in the Democratic contest by winning Arizona, routing U.S. Senator Bernie Sanders of Vermont.
The contests in Arizona and Utah took place on the same day that attacks in Brussels killed at least 30 people, adding to Americans' concerns about the threat from Islamist militants.
"This is a time for America to lead, not cower," Clinton told supporters in Seattle in a victory speech she used to attack Trump and Cruz for views she said were out of step with most Americans.