A fire at Prague?s Barrandov Film Studios has burned through the set of History?s upcoming scripted drama series ?Knightfall.? The extent of the damage remains unknown, but it is believed to significant, according to an individual familiar with the situation. No one was injured, and only exterior sets were affected by the blaze. Investigators have begun looking into the cause of the fire. Production on ?Knightfall? is expected to resume on Monday. ?Knightfall? was created and is executive produced by Don Handfield and Richard Rayner, with ?Avengers? star Jeremy Renner also serving as executive producer through his company, the Combine.