( CNN ) -- Investigators are trying to determine what led to the fatal mauling of a zoo worker by a tiger in northwest England , police said Saturday . Sarah McClay , 24 , died after being attacked Friday by a Sumatran tiger while working in the big cat enclosure building at the South Lakes Wild Animal Park in Dalton-in-Furness , the Cumbria Constabulary said . The enclosure has various indoor and outdoor compartments connected by lockable doors , police said . Keepers enter various parts of the enclosure to perform duties . `` However , systems are in place ( to ) ensure that animals and keepers remain apart at all times , '' the constabulary said in a statement posted on its website . `` At some stage this has failed and the animal and Sarah came together with tragic consequences . The police are working to establish whether this was a result of human or technical factors . '' Zoo owner David S. Gill asked for the public 's support , understanding and prayers in the aftermath . `` The park is a very safe environment and never at any stage were any other public or staff in danger , '' Gill posted Saturday on the zoo 's Facebook page . `` We have been given the all clear by the authorities after initial investigations yesterday and we hope you will allow us all to work through this tragic event . '' Worker mauled to death at Californian sanctuary by her favorite lion . CNN 's Neda Farshbaf and Ed Payne contributed to this report .
NEW : Sarah McClay , 24 , died after being mauled by a tiger . She was working in enclosure when she was attacked . Police are trying to determine what exactly happened .