Two election clerks in Broward County in the crucial state of Florida have been fired over voting violations in the US presidential elections, the country's Board of Elections Public Information Officer (PIO) Tonya Edwards said Tuesday.

The clerks were fired because they were "not working to the level of integrity they were trained to" and not "adhering to procedures," Edwards told CNN.

The clerks have been replaced. Voting is said to be back to normal.

Florida's role in the US elections is considered crucial for either of the two major-party candidates to win the presidency since the southeastern US state has 29 electoral votes, fourth most in the country.

Its diverse 18.8-million population comprising immigrants from Latin America, primary Cubans, military retirees and people over 65 as well as those who arrived in Florida from around the country to work in the flourishing entertainment industry, mirrors heterogeneous composition of the US society while the outcome of local voting indicates nation-wide trends.

The state occasionally determines the result of the whole election, making it the largest swing state and the ultimate political battleground. In 2000, Florida's electoral votes gave the election to Republican George Bush in 2000 in his showdown with Al Gore while in 2012 Democrat Barack Obama bested his rival Mitt Romney by only 0.9 percent.

According to the Real Clear Politics average of national polls, Republican presidential nominee Donald Trump was leading against Democratic nominee Hillary Clinton in Florida ahead of the vote by 0.4 percent (47.0 percent versus 46.6 percent). In Presidential primary elections in Florida Trump gathered 1,077,221 votes (45,7 percent of the Republican ballots, won the primaries) while Clinton received 1,097,400 votes (64.4 percent of the Democratic ballots).