BBC Worldwide is investigating the leak of scripts for the upcoming season of "Doctor Who" after five scripts turned up online weeks before the science-fiction drama returns with actor Peter Capaldi in the lead role, the BBC reports.

BBC Worldwide issued a statement confirming the leak, saying it is looking into "a security issue around 'Doctor Who' Series Eight where unfinished material has inadvertently been made public."

The statement from the British broadcaster asks people with access to the scripts and “spoilers associated with it not to share it with a wider audience so that everyone can enjoy the show as it should be seen when it launches.”

The statement adds: “We deeply regret this and apologise to all the show's fans, the BBC and the cast and crew who have worked tirelessly making the series.”

The scripts, labeled “private and confidential,” were reportedly leaked from a BBC Worldwide office in the U.S., the article notes. The series will return with its U.K. premiere Aug. 7, with the U.S. premiere scheduled for Aug. 23.