Security staff say Danny Nightingale is in the main hall of the court waiting to walk out.
More top news
The 36-year-old was last seen on Thursday evening.
Sophie Neville, cast as Titty as a young child in the 1974 classic Swallows and Amazons, is advising its modern-day adaptation.
At least two people are feared dead in the attack which is the latest on medical facilities in the war-torn country.