When vote counting for the Republican and Democratic primaries for the 2016 US presidential poll in Missouri was completed on Tuesday night, Hillary Clinton and Donald Trump lead their respective party primaries by less than half a percentage point.
Since the margin of victory in each case is less than one percentage point, CNN and other US networks said they will not project a winner in either contest.
Overseas absentee ballots will be accepted until Friday.
The recount law in Missouri allows a second-place finisher to request a recount if the margin of victory is less than half a percentage point. As the count stands now, both margins of victory are small enough that Democrat Bernie Sanders or Republican Ted Cruz would be able to request a recount to verify the findings, if they choose to do so, the report said.
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"There are questions about whether candidates on both sides of the aisle will ask the state for a full recount," NewsChannel 5 said.
For Republicans, 52 delegates are up for grabs and 71 will be awarded to Democrats.
At the end of voting, real estate tycoon Trump was ahead of Texas Senator Cruz by just 1,726 votes in the Republican race. But it was much tighter on the Democratic side with former Secretary of State Clinton ahead of Senator Sanders by only 1,531 votes.
But political experts does not appear to think a recount would be a major game changer for any one candidate, the report said.
Missouri saw more than 1.5 million ballots, or 39 per cent of registered voters, cast on Tuesday. That was the highest amount recorded for a Presidential primary in Missouri history. The previous record of 1.4 million, or 36 per cent, was set during the 2008 primary.