Police and paramedics were called to the scene of the serious incident at Warner Bros. Studios with a spokesperson confirming to the Hertfordshire Mercury that a "knife-related incident" had taken place.
"One man sustained a neck injury and was taken to hospital by ambulance," a spokeswoman disclosed in a statement.
"A second man was arrested on suspicion of wounding with intent to do grievous bodily harm and is currently in police custody. It is believed the men are known to each other. Enquiries are continuing at this time to establish the circumstances around what happened," they continued.
In an official statement, a spokesperson for Warner Bros. added: "I can confirm that there was an isolated workplace incident at the Warner Bros. studio production facility and the police are now handling the matter."
In the new film, Hathaway plays the Grand High Witch, who was originally played by Angelica Huston in the 1990 adaption. The popular 1983 fantasy book by Dahl is centred around two young boys who fight against a group of children-eating witches after stumbling upon their annual convention.
Octavia Spencer, who is playing the role of one of the boys' grandmothers, Chris Rock, and Stanley Tucci also star in the movie.