Voters can expect to see stepped-up security at polling sites across Long Island on Election Day after a potential threat to New York City.

The polls will be open early Tuesday, and both Nassau and Suffolk police say they will have extra patrols out all day. The measure comes after the NYPD announced it is investigating unconfirmed threats that al-Qaida or the Islamic State group might be planning an attack in New York or elsewhere on the eve of Election Day.

Suffolk Police Commissioner Tim Sini said at a news conference Monday that while there is no specific threat to the county, there will still be increased patrols.

In addition to terror concerns, police and election officials said they are wary of the expected larger-than-normal voter turnout and the contentiousness that has been seen throughout the presidential campaign.

Nick Lalota, the Republican commissioner of the Suffolk Board of Elections, said they are ready for the day and have already received tens of thousands of absentee ballots.

Sini would not disclose how many officers will be on patrol Tuesday, but Lalota said there will be 40 patrol cars for the county's 330 polling stations.

The NYPD plans to have more than 5,000 officers patrolling the streets on Election Day.