Constantine set was haunted?

Sounds like a publicity stunt to me for the opening of Constantine in Britain:

Keanu Reeves and director Francis Lawrence were overcome with fear when supernatural forces disrupted shooting on a vital CONSTANTINE scene.

The cast and crew had gathered in sound stage 16 at WARNER BROS' Hollywood lot to work on the spooky blockbuster, but were soon desperate to leave the building when paranormal activity started to arise.

And it was particularly terrifying for all present - because they were all aware of the spooky forces that had tormented movie-makers working on THE EXORCIST and POLTERGEIST.