A tiger kills zoo worker Friday in an enclosure at South Lakes Wild Animal Park near Dalton-in-Furness, Cumbria.

The North West England area attack happened when a tiger kills zoo worker Sarah McClay and authorities told reporters they are unsure of how it happened.

The Sumatran tiger kills zoo worker was because of "human or technical factors," according to authorities, but they are still investigating how the 24-year-old McClay came in contact with the tiger.

She was attacked in the big cats' enclosure when she was mauled at South Lakes Wild animal Park, according to Global Post. McClay was pronounced dead on the scene and taken to Preston Royal Infirmary while the park was closed.

A spokesman for the park said in a statement: "The tiger is securely locked in its enclosure and there is no further risk to the public. Members of the public were not at any risk. The wildlife park has closed early and all visitors have left the park."

Cumbria Police Detective Superintendent Andrew Slattery said the investigation was centered on "the management of dangerous animals."

Slattery also said that "system and protocols" of the park were being investigated. He also said it was not being considered a criminal investigation.

Park owner David Gill said there was "no reason" for McClay to be in the tiger enclosure, while authorities said compartments in the tiger enclosure were connected by lockable doors, but systems put in place to keep staff and animals apart had "failed."

McClay was considered an experienced member of the zoo by its owner David Gill.

"We have very strict protocols and procedures for working with big cats, but it seems she failed to follow correct procedures," he told the Global Post. "For inexplicable reasons she opened a door and walked into the enclosure. We will never know why she entered without telling anyone. There was no reason for her to go in there."

Gill then reached out to the public for prayers and understanding of what took place Friday.

"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."