LONDON—Batman star Christian Bale was arrested Tuesday over allegations of assaulting his mother and sister, police and British media said.

The 34-year-old actor spent four hours at a London police station before being released on bail.

British media had reported that Bale’s mother and sister complained he had assaulted them at the Dorchester Hotel in London on Sunday night, a day before the European premiere of his latest film, “The Dark Knight.”

The Sun newspaper said police did not question the actor Monday because they did not want to interfere with the premiere of the movie.

Asked Tuesday whether Bale had been arrested, a London police spokesman did not refer to him by name but said: “A 34-year-old man attended a central London police station this morning by appointment and was arrested in connection with an allegation of assault.”

The spokesman spoke on condition of anonymity because force policy did not authorize him to be identified. British police do not name suspects before they are formally charged.