Washington (CNN) Democratic Party officials are reviewing results from the Iowa caucuses after a "very small number of concerns" were raised, a spokesman said Saturday.

Sam Lau, a spokesman for the state Democratic Party, told CNN Saturday that "both the Sanders and Clinton campaigns have flagged a very small number of concerns for us, and we are looking at them all on a case-by-case basis. We are still in the review process of gathering information and speaking with local leaders."

Lau did not provide additional details. The Des Moines Register first reported the review

Some of the controversy stems from apparent confusion about the caucus process. The winner of the caucuses is decided by state delegate equivalents, tied to a math formula, not head counts.

There's also been some confusion about how much of a role -- if any -- coin flips played in determining who won delegates.

Photos: Iowa caucuses kick-start presidential race Photos: Iowa caucuses kick-start presidential race U.S. Sen. Ted Cruz emerges victorious at a rally Monday, February 1, in Des Moines after taking first place in Iowa's Republican caucuses on Monday, February 1. With about 99% of precincts reporting, Cruz had 28% of the vote, compared with 24% for Donald Trump and 23% for U.S. Sen. Marco Rubio. "Iowa has sent notice that the Republican nominee and the next president of the United States will not be chosen by the media, will not be chosen by the Washington establishment," Cruz said. Hide Caption 1 of 19 Photos: Iowa caucuses kick-start presidential race With former President Bill Clinton and daughter Chelsea at her side, Democratic presidential candidate Hillary Clinton addresses supporters February 1 at Drake University in Des Moines. The following morning, the Clinton campaign declared victory in the razor-thin contest against Sen. U.S. Bernie Sanders. "Hillary Clinton has won the Iowa caucus," the Clinton campaign said. "After thorough reporting -- and analysis -- of results, there is no uncertainty and Secretary Clinton has clearly won the most national and state delegates." The Iowa Democratic Party indicated in a separate statement it was not ready to make a call. Hide Caption 2 of 19 Photos: Iowa caucuses kick-start presidential race Sanders and his wife, Jane, acknowledge the crowd as he arrives for his caucus night rally in Des Moines. "Nine months ago, we came to this beautiful state, we had no political organization, we had no money, we had no name recognition and we were taking on the most powerful political organization in the United States of America," Sanders said. "And tonight, while the results are still not known, it looks like we are in a virtual tie." Hide Caption 3 of 19 Photos: Iowa caucuses kick-start presidential race Trump gives supporters the thumbs-up as he concedes defeat in Des Moines. Trump vowed to win next week's New Hampshire primary. "We will go on to get the Republican nomination, and we will go on to easily beat Hillary or Bernie," Trump said. "We finished second, and I have to say I am just honored." Hide Caption 4 of 19 Photos: Iowa caucuses kick-start presidential race Rubio addresses his supporters at a caucus night rally in Des Moines. "This is the moment they said would never happen," Rubio said. "For months, they told us we had no chance. They told me that I needed to wait my turn, that I needed to wait in line. But tonight here in Iowa, the people of this great state have sent a very clear message: after seven years of Barack Obama, we are not waiting any longer to take our country back." Hide Caption 5 of 19 Photos: Iowa caucuses kick-start presidential race Clinton supporters in Des Moines watch the television as caucus results roll in. Hide Caption 6 of 19 Photos: Iowa caucuses kick-start presidential race Trump supporters attend a watch party in West Des Moines. Hide Caption 7 of 19 Photos: Iowa caucuses kick-start presidential race A Sanders supporter celebrates caucus results at a Des Moines precinct. Hide Caption 8 of 19 Photos: Iowa caucuses kick-start presidential race Republican voters sing the national anthem in the gymnasium of an elementary school in Adel, Iowa. Hide Caption 9 of 19 Photos: Iowa caucuses kick-start presidential race Paper ballots are counted at a middle-school auditorium in Des Moines. Hide Caption 10 of 19 Photos: Iowa caucuses kick-start presidential race A Rubio supporter holds a sign at a caucus site in Clive, Iowa. Hide Caption 11 of 19 Photos: Iowa caucuses kick-start presidential race Sanders watches caucus returns at his hotel room in Des Moines. Hide Caption 12 of 19 Photos: Iowa caucuses kick-start presidential race People sign in as they arrive at a Democratic Party caucus in Keokuk, Iowa. Hide Caption 13 of 19 Photos: Iowa caucuses kick-start presidential race Iowans register to cast their ballot in Ames. Hide Caption 14 of 19 Photos: Iowa caucuses kick-start presidential race Caucus workers check in voters prior to a Republican Party caucus in Keokuk. Hide Caption 15 of 19 Photos: Iowa caucuses kick-start presidential race The shadows of lined-up caucusgoers are seen outside a school in West Des Moines. Hide Caption 16 of 19 Photos: Iowa caucuses kick-start presidential race Clinton poses for selfies at her campaign office in Des Moines. Hide Caption 17 of 19 Photos: Iowa caucuses kick-start presidential race Trump pauses for a selfie while visiting the St. Francis of Assisi Church, a caucus site in West Des Moines. Hide Caption 18 of 19 Photos: Iowa caucuses kick-start presidential race Cruz speaks earlier in the day at the Green County Community Center in Jefferson, Iowa. Hide Caption 19 of 19

Coin flips -- specifically "games of chance" -- are used in rare circumstances at precinct caucuses to adjudicate ties or resolve issues created by rounding errors. At stake at these precinct-level coin flips is the one remaining slot in that precinct for a campaign to send a delegate to attend that precinct's county convention. Coin flips are not used to decide which candidate wins a state convention delegate or national convention delegate.

Sanders was asked about the controversy at Thursday's Democratic debate hosted by MSNBC

"We think, by the way, based on talking to our precinct captains, we may have at least two more delegates," Sanders said. "At the end of the day, no matter how it's recounted, it will break roughly even."