Initially, the revolutionaries falsely alleged that SAVAK intelligence agents were in pursuit of individuals who ran into the theatre and used it as an opportunity to hide in a large crowd. Later, the fugitives (or the SAVAK agents chasing them) locked the cinema doors.
At first, the revolutionaries accused SAVAK agents of being after those who ran into the theater and used it as a hiding place.  Later, the fleeing individuals or the pursuing SAVAK agents locked the cinema doors.