Two men have been arrested on suspicion of attempted murder after a man was "seriously injured" in an attack at Thorpe Park.
The victim suffered a slash wound to his stomach following an altercation between two groups on the theme park's footbridge at around 4.50pm.
Guests were locked down as police arrived.
The injured man was taken to hospital and his condition is described as serious.
The two suspects, both in their 20s, remain in custody.
The incident is not being treated as terror-related.
In a statement, a Thorpe Park spokesperson said: "The resort's security team and fully trained medical staff were at the scene within minutes and administered immediate care until emergency services teams arrived.
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"The police were alerted immediately and the resort is co-operating fully with their investigations."
They added: "We will be maintaining contact with both the injured guests' family and the police."
Detective Inspector Andy Greaves said: "I'm keen to hear from anyone who saw what happened or who has video footage of this assault.
"The two groups of people were close to the exit inside the park on the bridge when the assault took place.
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