has been accused of assault by his mother and sister.'The Dark Knight' star allegedly lashed out at London's Dorchester hotel on Sunday (20.07.08), where he has a suite. His mother Jenny, 61, and sister Sharon, 40, went to a police station in Hampshire, Southern England, yesterday (21.07.08) to lodge a formal complaint against him. Bale, 34, was allowed by police to attend the European premiere of 'The Dark Knight' - in which he plays superhero Batman - last night but will face questioning over the claims. A police source told Britain's The Sun newspaper: "It was a very difficult situation but it would have been wrong to have wrecked the premiere over a complaint which we don't yet know is founded in truth. But Mr. Bale will be contacted at the earliest opportunity and be asked to provide an account of anything that happened." Police in London are expected to speak to the Welsh actor later today (22.07.08). A spokesperson for London's Metropolitan Police said: "We can confirm we have received an allegation from another force in relation to an alleged incident in central London." Bale appeared calm at the premiere - which was also attended by his co-stars Sir Michael Caine, Maggie Gyllenhaal and Aaron Eckhart - in London's West End, taking time to sign autographs for fans.