Separate shootings across the United States have left at least two people dead and two others wounded during clashes over bargain items on a record-breaking Black Friday.

The incidents happened in three US states, including New Jersey, Tennessee and Nevada, according to officials.

In a shooting in the parking lot of a Macy's store in Hamilton Township, New Jersey on Friday morning, 21-year-old Demond Cottman was shot and killed.

His brother, Shadi Cottman, 26, was shot in the leg and rushed to a local hospital, according to police.

“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,” a shopper told CBS.

Police cars at the scene of a shooting outside of a Macy's department store in New Jersey on Friday morning, November 25, 2016 (Photo by CBSNews)

In another shooting at Wolfchase Galleria Mall in Memphis, Tennessee, a man was injured on Thursday night.

"We are aware of an incident at the mall and are working closely with local law enforcement as they continue their investigation," a spokesperson for the mall said in a brief statement.

Also in Reno, Nevada, a man was fatally shot following a dispute in a Wal-Mart parking lot on Thursday night.

According to police, two people got into a fight "over a parking spot" before one of them opened fire, killing the other one.

"Police said both persons involved were armed with weapons and a 33-year-old man was shot dead at the scene," the Associated Press reported.

"Investigators say no arrests have been made, but those involved in the shooting have been located. The vehicles and gun have also been recovered," the AP added.

Chaotic scenes at a mall in Modesto, California just around midnight on Friday, November 24, 2016. (Photo by NewsFlare)

Black Friday has started the holiday shopping season in the US for years with retailers offering substantial discounts. However, violence erupts either outside or inside big stores, inflicting heavy causalities.