LONDON, Feb. 6 (UPI) -- A source at a London theater says a man was arrested outside the site amid concerns he was stalking British actress Keira Knightley.
The Comedy Theatre source, whose identity was not released, said while Knightley was performing at the West End theater, she became concerned about a male fan who repeatedly made advances, Sky News reported Saturday.
"Keira felt threatened by this guy who turned up a number of times and tried to speak to her," the source said.
"He did not make any specific threats to her but she was concerned enough to call in the police."
Police confirmed a 41-year-old man identified as Mariek Daniluk was arrested Thursday on suspicion of harassment.
Sky News said concerns about being stalked are nothing new to Knightley, who decided to leave the United Kingdom two years ago amid concerns of having multiple stalkers.
"I've no way of knowing if they could be potential rapists. I'm frightened out of my wits every time I see one of them," Knightley, 24, said at the time.