Cumbria tiger attack: Sarah McClay dies of her injuries
25 May 2013 Last updated at 21:05 BST
The death of a zoo worker attacked by a tiger could have been due to "human or technical factors", police said.
Sarah McClay, 24, was attacked by a Sumatran tiger in an enclosure at South Lakes Wild Animal Park, near Dalton-in-Furness, Cumbria, on Friday.
Detectives are investigating how Ms McClay and the animal came into contact, "with tragic consequences".
Park owner David Gill said there was "no reason" for Ms McClay to be in the enclosure with the tigers.
Ed Thomas reports.