Production in England stopped on Friday, after Singer was "unexpectedly unavailable" for several days, according to an official statement.
There have been rumors of Singer clashing with star Rami Malek since production began, most notably due to Singer's absence and his "unreliability and unprofessionalism". Sources close to the outlet state that Tom Hollander, who portrays Queen band manager Jim Beach, "briefly quit the film" due to Singer's erratic behavior, though he was ultimately "persuaded to return".
THR claims that a representative from the DGA has been on set to monitor the situation, which has apparently turned so toxic that Singer is said to be suffering from PTSD.
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Malek, who's made a name for himself as the star of the hit US series Mr. Robot, complained to Twentieth Century Fox about Singer's behavior. (It's not known whether Singer hurled the object at Malek directly, in his general direction, or away from him.) The pair resolved their differences shortly after, and filming on Bohemian Rhapsody was set to pick back up again.
Sources tell the publication that Singer's unprofessional behaviour on and off set resulted in multiple complaints to the studio.
Word around town is that Fox has been having discreet discussions with replacement helmers to finish the film, even before the studio halted production today.
Insiders said the studio still hopes to get the film on track for a December 25, 2018 release.