Emergency services were called to Shoalhaven Zoo north of Sydney on Friday morning where a 35-year-old woman suffered serious head and neck injuries, police and ambulance statements said.
Ms Brown saw them coming and contacted colleagues by two-way radio but it was too late.
"Upon arrival police found a 35-year-old female employee suffering wounds to the neck and the head within a lion enclosure", police superintendent Greg Moore said.
Police are investigating the incident.
Lions depart zookeeper, 35, combating for all times after brutally mauling her inside their enclosure
The woman suffered face and neck injuries on Tuesday at Shoalhaven Zoo, about 150km (90 miles) south of Sydney.
An ambulance is seen leaving the Shoalhaven Zoo, where a worker was wounded in a lion attack, in Nowra, Australia, May, 29, 2020.
"I'll take this opportunity to commend the two zoo staff that reacted to the incident and were able to secure the lions and support their colleague", he told reporters in Nowra. "We ask that you continue to pray for her and her family".
UPDATE 12.32PM: Inspector Faye Stockman, Duty Operations Manager, NSW Ambulance has addressed the media.More news: Los Angeles Synagogue Vandalized With 'Free Palestine,' 'F--- Israel' Graffiti
"Being the first to walk into the enclosure was one of the most frightening experiences - we literally had to walk into a lion's den", Ms Stockman said.
It's not the first animal attack at Shoalhaven Zoo. She also described the attack as "extremely vicious".
'While we're closed to the general public we as a household will proceed to dwell onsite and have key employees coming in to assist us guarantee the security and wellbeing, cleaning and feeding of all our animals, ' the put up reads.
The experienced zookeeper was airlifted to St George Hospital and remains in a critical condition.More news: Apple Sells Refurbished iPhone XR Variants Directly From its Website
'Have the expertise of a life time getting near our Big Cats.
Trent Burton, aged in his 30s on the time, was grabbed by a 3.7m crocodile, generally known as John, and dragged him into the water.
The employee was attempting to lure the animal out of its enclosure with a chunk of meat when it latched onto his hand in entrance of about 60 spectators.More news: Chris Paul, Trae Young already play HORSE in real National Basketball Association games