Plot: A television reporter and her cameraman are assigned to spend the night shift with a Los Angeles fire crew. After a routine 911 call takes them to a small apartment building, they find police officers already on the scene in response to blood curdling screams coming from one of the apartments. They soon learn that a woman living in the building has been infected by something unknown. After a few of the residents are viciously attacked, they try to leave with the news crew, only to find the building has quarantined. All communication in and it is stopped; the only evidence of what took place is the news crew's videotape.
Alternative Plot: Reporter Angela (Jennifer Carpenter) and her cameraman Scott (Steve Harris) are doing a story on night-shift firefighters for a reality-TV program. A late-night distress call takes them to a Los Angeles apartment building, where the police are investigating a report of horrific screams. The TV team and emergency workers find an old woman, who suddenly attacks with teeth bared. What's more, Angela and company find that the building has been sealed by CDC workers. Then the attacks really begin.
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