Officers at the scene of the shooting which saw a man, woman and toddler killed (Image: Getty Images)

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A murder-suicide inside a supermarket has left a man, woman and toddler dead, police have confirmed.

A crime scene remains in place outside a Publix grocery store, inside The Crossroads Shopping Center in Royal Palm Beach, Florida, USA, following Thursday's incident.

Investigators understand two of those who died were a grandmother and her grandson.

It is unclear who the shooter was but a handgun was found at the scene, according to local media reports.

Officers were dispatched to the incident at the corner of Royal Palm Beach Boulevard at Okeechobee Boulevard just after 11.30am.

Palm Beach County Sheriff's Office spokeswoman Teri Barbera said when responders arrived they found three people dead near the produce area of the shop.

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Officers found the three deceased in the store's produce aisle
(Image: Getty Images)

One deputy was at a neighbouring dry cleaners when the shooting occurred and rushed to the scene, though the incident was over when he got there, she told WPTV.

"It is possible they know each other," Ms Barbera said, referring to those who died.

The force said in a statement: "Upon arrival, deputies located three individuals deceased from gunshot wounds."

The shooting occurred at the Publix grocery store in Royal Palm Beach
(Image: Getty Images)

"The shooter is one of the deceased," the statement added, without elaborating on the killer's gender.

"This was not an active shooter situation."

Palm Beach County Commissioner Melissa McKinlay confirmed the child was a toddler.

"This one is hard. You don't like to hear about these things in your district. You don't like to hear about them anywhere in the country," she said.

15 to 20 Palm Beach County Sheriff's Office vehicles were in the supermarket's carpark following the incident, according to witnesses.

A Publix spokesperson said: "Our thoughts are with those who are impacted by this tragedy.

"We are cooperating with the local law enforcement.

"Since this is an active police investigation, we cannot confirm any additional details."