Directed by Jaume Balagueró and Paco Plaza, REC follows a television reporter and her cameraman who become trapped inside a quarantined apartment building during a violent outbreak in Barcelona. Presented entirely through handheld camerawork, the film combines found footage horror, claustrophobic survival tension and infection-driven panic as the situation inside the building escalates into chaos. REC became one of the defining European horror films of the 2000s and later inspired the American remake Quarantine.

Arrow Films

28 Days Later meets The Blair Witch Project as a mysterious virus turns the inhabitants of an apartment building into a horde of frenzied, bloodthirsty ghouls in [REC] - the original 2007 "found footage" phenomenon that spawned a hit franchise and US remake.

A television film crew, documenting the night shift of a Barcelona fire brigade, get much more than they bargained for when they attend an apparently routine call-out. Upon arrival at an inner city apartment, the firefighters are viciously attacked by the elderly female occupant, who appears to be in the throes of some sort of viral infection. Before long, the virus has taken hold of the entire building, which is cordoned off by the authorities. Trapped inside, the television crew - using their cameras to capture the events as they unfold - and the other remaining survivors find themselves pitched into a nightmare of unimaginable proportions.

Fusing the zombie genre with the "found footage" format to throw the audience right into the midst of the action, [REC] is a terrifying, relentless rollercoaster ride which builds to one of the horror genre's all time bone-chilling climaxes.

Från IMDB:
A television reporter and cameraman follow emergency workers into a dark apartment building and are quickly locked inside with something terrifying.