The BBC has received more than 50 complaints after an unedited version of actor Christian Bale‘s on-set rant was aired during its Breakfast show.

Viewers were furious after hearing the 35-year-old Batman star – who hit the headlines for the outburst in which he shouted at a crew member on the set of Terminator: Salvation – say the words “You don’t f****** understand,” before the sound was cut.

Embarrassed presenters Susannah Reid and Charlie Stayt were then left to apologise to viewers after the clip had been aired.

“Huge apologies to anyone who was offended by that,” Reid said. “Sorry, that should have been edited,” added Stayt.

Ofcom is now investigating the incident, while a BBC spokeswoman issued an apology.

“A technical error led to us broadcasting an unacceptable swear word on Breakfast this morning,” the spokeswoman said. “We apologised on air immediately afterwards. We are sorry for any offence caused.”

Bale’s now infamous rant was directed by Shane Hurlbut, director of cinematography on Terminator: Salvation, and happened just days after he was arrested last summer for allegedly assaulting his mother and sister at a London hotel. Charges against the star were later dropped

Bale called a Los Angeles radio station to apologise for his behaviour on Friday. “I acted like a punk,” he said. “I regret that and there is nobody who has heard that tape who has been hit harder by it.”