Two people have been shot during the annual Black Friday sales in the US.

One person died after a shooting in a parking lot in South Jersey outside Macy's, CBS Philly reports, while his brother was also shot and injured.

Another was killed during a road rage incident in Reno, Nevada over a parking spot in a Walmart, according to KOLO.

Witnesses told CBS Philly the shooting outside a Macys department store in Atlantic County was a "tragedy" that was "very scary". Witnesses reported shell casings surrounding a bullet-riddled SUV in the parking lot.

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"It's a tragedy ... It's very scary you know, you're starting off the holiday season and you're excited about the upcoming times with family and now there's going to be family who are missing people and their holidays will never be the same," one shopper said.

In Reno, Police Department, Lt. Scott Shaw said the incident started as a road rage incident and turned into a fatality. Police are appealing for the public's help to find a man believed to be involved.

Between 2006 and 2014 there were seven deaths and 98 injuries during Black Friday shopping, Mail Online reports.

Earlier: A woman was captured on film ranting inside a Walmart during the Black Friday sales frenzy as the shopping craze sweeps the world.

The YouTube video shows her pacing inside the shop asking staff "Why is everybody confused in here?". Other shoppers remind her "there are kids in here" and ask: "Are you drunk?"

She notices she's being filmed and faces up to the camera before saying "I'm on all kinds of websites" and waving hello and storming off again.

Elsewhere, a fight broke out inside a Walmart in Columbus, Mississippi, as shoppers wrestled over items. One video shows shoppers tustling over a DVD player inside the hugely crowded shop.

The sales frenzy began on Thanksgiving in the US where shoppers in New York lined up outside Macy's by 5pm.

Australian woman in the Big Apple Maria Elfes said: "It's manic. It's crazy, but it is fun."

Australians are expected to shop up a storm online on both at home and in the US.

Australia Post's eCommerce general manager Ben Franzi said registrations for a shipping service spiked in Australia as many sought deals they don't normally get locally.

"In the lead up to this year's Black Friday sales, monthly registrations of our US freight forwarding service, ShopMate, tripled," Mr Franzi said.

"In the past month we had about 13,500 new registrations, compared with our monthly average of 3000 to 4000 new registrations."

In Greece, shoppers were seen queuing outside a department store before it opened. In the UK, many appeared to shun the shops and opt to spend their money online instead. An off-duty policeman was stabbed outside an HMV store in Leeds, The Sun reports.