The new police unit is a security measure in response to last year's deadly shooting attack at a Hanukkah festival.

Heavily-armed police officers have started patrolling Sydney's streets, as part of heightened security measures following last year's deadly shooting at Bondi Beach.

The Armed Response Command (ARC) will see specially trained officers in busy tourist areas carrying long-arm rifles – an unfamiliar sight for most residents.

New South Wales police say the officers will also patrol major events like sports matches and places of worship "to prevent, deter and rapidly respond to serious threats, including active armed offender incidents".

Fifteen people - including a 10-year-old girl – were killed in December when two gunmen opened fire on an event marking the Jewish festival of Hanukkah at the popular beach.

The attack was Australia's worst mass shooting in almost three decades and prompted sweeping gun law reforms and a crackdown on hate speech.

But another woman told the broadcaster that seeing police with weapons made her feel safe.

ARC is specifically designed to be "highly visible across Sydney, driving specialist vehicles and carrying rifles," New South Wales police said in a statement.

Its role "is built on a simple principle - preserving life," Detective Superintendent Andrew Evans said.

The shooting on 14 December put huge pressure on Prime Minister Anthony Albanese's government, with calls for immediate action on antisemitism.

Jewish communities have welcomed the new police operation, which will eventually consist of 250 officers, but others have called for safeguards to protect human rights.

"No Australian wants to see officers with military weapons on our streets, but the sight of body bags is far worse," Alex Ryvchin, co-CEO of Executive Council of Australian Jewry, said.

But Amnesty International Australia said it was concerned about the "militarisation of policing", and asked for assurances from the state government that ARC will not be used to suppress peaceful protests.

"Any expansion of police powers and capabilities must be accompanied by clear, publicly accessible rules, robust independent oversight and accountability," said the organisation's Andrew Witheford.

"Our world changed forever. That's just the truth of it, right across this country. And I said it at the time, we will never be the same again," the state's Police Minister Yasmin Catley told the ABC.