Two New York synagogues have been searched by police after bomb threats caused panic on Christmas Eve.

Police scoured the Shaare Zion Temple in Brooklyn and Riverdale Jewish Center in the Bronx at around 6.15am Sunday following a 911 call, NYPD told DailyMail.com.

The department was unable to share any details about the threats the synagogues received but said they are believed to have been sent via email.

'Officers responded and searched the buildings and found no devices,' an NYPD spokesman said. 'Nothing was found.'

The department said cops would continue 'canvassing and patrolling' the areas hit by the latest swatting incidents - which is when people call the emergency services about false threats.

Hundreds of synagogues across America have been targeted with menacing messages about fake bombs since Hamas slaughtered around 1,200 people in Israel on October 7.

Last weekend, a nationwide swatting spree sent threats to almost 200 Jewish institutions in what the FBI believe was part of a coordinated effort by a foreign group.