Batman star Christian Bale has been arrested by detectives investigating claims he assaulted his mother and sister, police sources say. His arrest comes just a day after the actor attended the premiere of his new film, The Dark Knight, in London. Bale, 34, is alleged to have lashed out at the two family members in his suite at Park Lane's Dorchester Hotel on Sunday. The British actor, who plays the Caped Crusader, is being questioned at a central London police station, sources added. The two women, who live in Dorset, went to a Hampshire police station yesterday to make a formal allegation. The complaint about the actor was then passed to the Metropolitan Police for further investigation. A police spokeswoman said: 'A 34-year-old man attended a central London police station this morning by appointment. 'He was arrested in connection with an allegation of assault. He currently remains in custody.' Bale had joined Batman co-stars Sir Michael Caine, Maggie Gyllenhaal and Aaron Eckhart at the Odeon West End cinema in Leicester Square last night.