Billy Vunipola has 'unreservedly' apologised after an alleged violent incident in Majorca in the early hours of Sunday morning.
PA says the Saracens number eight has been fined €240 for resisting the law while he was leaving a club on the Spanish island.
Reports surfaced on Monday morning that Vunipola had been tasered by police at a bar called Epic in the island's capital Palma.
The 31-year-old is alleged to have threatened customers and staff with bottles and chairs before police were called.
Billy Vunipola: The England rugby star has apologised following an alleged incident in Majorca
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Reports say police attempted to fire a taser at Vunipola but the first volt was not effective.
A second volt was needed before the star, who weighs nearly 20 stone, was handcuffed by officers.
Reports say he was taken to a hospital where he was kept under guard before he went to court later on Sunday.
Vunipola, who played for Saracens on Friday night, was released on bail pending an investigation.
PA now says that the Australian-born star has 'unreservedly' apologised and has been issued a fine of €240.
Saracens tweeted a statement on Monday morning confirming they were investigating the reports.
It read: "Saracens is aware of an incident involving Billy Vunipola in Majorca.
"We will of course deal with this incident internally, and will not make any further comment until then."
A spokesperson for the National Police in Majorca said: "In the early hours of yesterday morning, at 4.30am, we arrested a 31-year-old foreign man on suspicion of a crime of disobedience and assaulting a police officer.
"The events took place in a leisure establishment on the seafront in Palma, when a man was causing altercations inside the establishment.
"The man would not listen to reason and confronted the rest of the customers, and the security staff were unable to restrain him or remove him from the premises.
"The police were alerted and the officers, on seeing the man, who was shirtless and making gestures with his hands, cleared the premises.
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Billy Vunipola was involved in an alleged incident in Majorca at the weekend
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"It was then that he confronted the police and attempted to assault the officers.
"The police officers tried at all times to get him to calm down, but the man would not listen to reason.
"At that moment, the man pushed and slapped an officer and a policeman pulled out his electric stun gun and fired a first time although the gun didn't discharge.
"A second projectile was then fired, which did the job, and it was then that the officers jumped on him and proceeded to immobilise him by shackling him, later taking him to Son Espases hospital for assessment and arrest.
Billy Vunipola has not played for England since last year
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"Yesterday afternoon he was taken to court and released on bail pending an ongoing investigation."
Vunipola has won 75 caps for England since making his debut in 2013.
He hasn't played for his country since last year and was not selected for the Six Nations earlier in 2024.
Vunipola is reportedly in line to leave Saracens for Montpellier which would effectively end his international career.