Hillary Clinton narrowly defeated Bernie Sanders in the Iowa caucuses, according to results announced by the state Democratic Party early Tuesday morning — a dramatic finish to a race so close that the Associated Press declined to call it even after all precincts except one had reported results.

Clinton was awarded 699.57 state delegate equivalents, versus 695.49 for Sanders, Iowa Democratic Party Chairwoman Andy McGuire said in a statement. The results were the closest in state Democratic caucus history, and 171,109 Democratic voters turned out to caucus.

With 99.9 percent of precincts reporting, Clinton had 49.9 percent of delegates and Sanders had 49.6 percent, according to the Associated Press. Former Maryland Gov. Martin O'Malley received less than 1 percent then suspended his campaign. A single precinct had yet to report as of 5 a.m. Eastern time; that precinct, in Des Moines, is worth 2.28 state delegate equivalents.

The AP said at 2 a.m. that it would not report a winner "at this time" because the race was so tight. It still hadn't done so as of 8 a.m.

The outcome gave both sides room to claim victory: Clinton in the ever-so-narrow lead she clung to as results trickled in throughout the night, and Sanders in the massive comeback the self-described democratic socialist mounted in the state against a front-runner who months ago looked unbeatable.