A MASSIVE brawl on a cruise ship was sparked by jealousy over a threesome, an eyewitness has said.
Shocking footage appears to show 60 partygoers battering each other in a scrap that erupted on the dancefloor of the vessel.
The dramatic clip shows security on board frantically trying to break up the fight after what started as a two-person scuffle escalated into a brawl.
Staff were forced to call out the Coast Guard as the ship, Carnival Magic, made its way towards a dock in New York City.
The fight started out between just two people before dozens more joined in, according to reports.
One of the passengers, Theresa James, told Fox News said it all kicked off at around 2am in the ship's nightclub and casino.
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Violence erupted when the threesome's significant others found out about their escapade, the travel agent revealed.
The brawl lasted an hour and eventually stretched between the fifth and first floors of the ship.
Eventually, Carnival's security team managed to restore order and James said if they hadn't the situation could have become much worse.
She described the guests involved in the fight as “ignorant fools acting stupid”.
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A clip shared on social media from the dancefloor shows a security guard attempting to calm the situation as revellers throw punches and smash glasses.
Screams echo around the venue as more people pile in, with fists flying as others film the commotion.
Some clubbers used bottles and glasses as weapons during the brawl, according to local reports, but no serious injuries were reported.
Staff were forced to call the Coast Guard. Officials took the ship back to port, cops say.
Officers were then stood down as passengers left the cruise liner, reports the New York Post.
The ship departed from New Jersey on June 20 before heading to Dominicana, Turks and Caicos and a private island in the Bahamas. It returned to the US today, tracking information shows.
Cruise liner bosses said the incident will be investigated.
They said: "Last night while Carnival Magic was returning to New York, a number of guests were involved in an altercation in a nightclub.
"Thankfully no serious injuries were reported and our onboard security team intervened.
"The ship arrived as scheduled this morning and shoreside law enforcement authorities were notified and met the ship to interview suspects and witnesses and conduct an investigation."
Officials have not yet confirmed whether the probe into the fight would be handled by cops in New York or New Jersey authorities, or whether it happened in international waters.
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