Devoted fans visited Cardiff to watch David Tennant and Billie Piper film for series two, however flashes and noises from cameras caused chaos.
A BBC spokeswoman told The Mirror, "Filming last week was disrupted by cameras with flash and those that made a beep every time they took a picture.
"Both are enough to stop a take and it takes a long time for the entire cast and crew to reset for another go. The most important request is please don't take photographs during an actual take."
