“Those two planes collided and crashed and just landed on the beach at Sea World.
“Four people have died today and three more are in hospital in a serious condition.”
Emergency room supervisor Janey Shearman said six other patients suffered injuries, mostly from broken glass.
“There’s a range of injuries, what we call multi-system trauma, which means there’s a lot of impact on the body,” he said.
A popular Gold Coast park has been hit by tragedy.
“We and the entire flying community are saddened by what has happened and offer our deepest condolences to all involved, especially the loved ones and family of the deceased,” said a spokesman for Sea World Helicopters.
“We are cooperating with all authorities, including the Australian Transport Safety Bureau and the Queensland Police.”
Prime Minister Annastacia Palaszczuk expressed her condolences to all those involved in the incident.
“What happened today on the Gold Coast is an unimaginable tragedy,” the prime minister tweeted.
“My deepest condolences go out to every family and everyone affected by this terrible tragedy.”
According to witness Jonathon James Spanol, the crash happened after the helicopters got too close, and the rear rotor of one clipped the other.
“Yes, 2 choppers collided. One seems to be going up and one is coming back in. The other landed on the sandbar after cutting his back. It’s behind us,” he wrote on his Facebook page.
Julie Cannock reported a loud explosion as the plane collided.
Ms Cannock said on social media: “Watching this happen before our eyes is terrifying.”
“Families and boats were happy on the beach below the crash site… They collided, rotors flew off and there was a loud explosion as chopper 1 in slow motion crashed onto the sandbar…still in shock. .. so sad for the families who had to enjoy these wonderful days.
Billy Tunks said on Facebook: “I saw that car hit something and it went straight down. Hope all is well.”
People in jets and boats raced to help victims on a small sand island near the theme park before paramedics and police arrived.
A LifeFlight helicopter circled the scene and another could be seen on the Flight Tracker website heading towards the site just before 3 p.m.
The Australian Transport Safety Bureau is investigating the collision, Chief Commissioner Angus Mitchell said.
“The ATSB is asking anyone who saw the collision or witnessed or has any video of the helicopters during any phase of the flight to contact [email protected],” he said.