There are no known, credible terror threats on Long Island or in New York City, local law enforcement officials said Friday — hours after an apparent terror attack in Nice, France.

But local agencies have intensified patrols and increased anti-terrorism countermeasures, monitoring social media and other communications in an effort to stay one step ahead of any potential plots, officials said.

“There will be an enhanced presence [of cops] for a variety of reasons over the weekend,” NYPD Commissioner William Bratton said Friday,

Bratton noted some street fairs, demonstrations and events planned for the city were related to Bastille Day.

When it comes to detecting possible threats, Suffolk Police Commissioner Timothy Sini said the public remains, in most cases, the eyes and ears. Sini urged residents to pay attention and report situations that seem unusual.

“Trust your gut,” Sini said, echoing a message reiterated by leaders throughout the metro area Friday.

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New York City Mayor Bill de Blasio said the NYPD is bolstering security at sites affiliated with France and the French government, as well as crowded areas where lots of people assemble. “We absolutely are on alert,” he said.

Nassau County police said they have resumed two-officer patrols previously in place for a 48-hour window after the attack last week in Dallas. County Executive Edward Mangano and acting Police Commissioner Thomas Krumpter also said in a news release that police have increased patrols covering mass transit and other critical infrastructure.

With Matthew Chayes and Anthony M. DeStefano