A man who allegedly threatened a member of the Jewish community during a flight from Bali has been arrested.

The 19-year-old from Sydney has been accused of making anti-Semitic threats and gesturing in a way that indicated violence towards another person, who he knew was part of the Jewish community.

Australian Federal Police officers arrested the man after he landed at Sydney International Airport on Wednesday and charged him with threatening force or violence against members of groups.

He was refused bail and is set to appear at NSW Local Bail Division Court on Thursday.

Law enforcement has been on alert for anti-Semitic incidents in the aftermath of a terror attack at a Hanukkah event on Bondi Beach.

Gunmen opened fire as hundreds gathered for the Jewish festival of lights, killing 15 people and injuring scores more.

Following the mass shooting, pressure has mounted on governments and law enforcement, with many criticising the police for not acting more quickly.

Two officers, including a probationary constable who had been in the job for four months, were seriously injured while responding to the attack.

NSW police on Tuesday arrested a man and charged him for allegedly displaying a Nazi symbol on a boat in the Lake Macquarie area.

Sydney and Melbourne have experienced a spate of anti-Semitic attacks in recent years, with synagogues and other Jewish community spaces being sprayed with offensive graffiti or firebombed.

Iran was found by the Australian Security Intelligence Organisation to have orchestrated at least two of the anti-Semitic attacks, on a Jewish kosher deli in Bondi and the Adass Israel Synagogue in Melbourne.

The morning’s headlines in 90 seconds, including more banks hike mortgage rates, a court appearance over a Hollywood murder, and a ‘c bomb’ earns quote of the year. (Source: 1News)