New Yorkers are voting in Republican and Democratic presidential primaries Tuesday.
Polls close: 9 p.m. (0100 UTC).
Delegates up for grabs
Candidates' estimated delegate counts so far
Donald Trump: 743
Ted Cruz: 545
John Kasich: 143
Hillary Clinton: 1,761
Bernie Sanders: 1,073
Needed to win nomination
Voting rules: New York is a "closed" primary, which means only registered Democrats can vote in Tuesday's Democratic primary. And only registered Republicans can vote in the GOP contest.
Unregistered voters: There are 3.2 million voters in New York who have registered with no party or a minor one. They will not be able to vote in Tuesday's Democratic or Republican contests.
Recent political polls
New York Democratic Presidential Primary by NBC/Wall Street Journal/Marist on April 14 shows Hillary Clinton with a 17-point lead over Sanders, 57-40.
New York Republican Presidential Primary by NBC/Wall Street Journal/Marist on April 16 shows Donald Trump with a 29-point lead over nearest rival John Kasich and a 38-point lead over Ted Cruz. Results showed Trump favored by 54 percent, over Kasich, with 25 percent, and Cruz with 16 percent.
Upcoming primaries: Primaries are being held April 26 in Connecticut, Delaware, Maryland, Rhode Island and Pennsylvania.
Democratic National Convention: July 25-28 in Philadelphia at the Wells Fargo Center
Republican National Convention: July 18-21 in Cleveland, Ohio, at the Quicken Loans Arena
General election: Nov. 8
Some material for this report came from AP.