A man has been stabbed to death in a frenzied attack in front of shoppers at the Westfield shopping centre at Parramatta in Sydney's west.
Emergency crews were called to the cosmetics section in the Myer store at 10.30am on Monday following reports of an attack.
Police said a 33-year-old man was stabbed multiple times by a man he knew just outside the department store in front of workers and children on school holidays in what they police may have been a "domestic related" dispute between the pair.
A witness, who did not want to be named, said he saw the attack from level 5.
He told AAP the attacker looked to be in his 40s and was taunting police officers at the scene.
‘‘He kept plunging the knife in his chest, in and out, and paced up and down the shopping centre screaming at police,’’ he said, adding that the man was stabbed three to four times.
‘‘He taunted the police, saying 'what are you scared of?'"
The man eventually left the knife in the man’s chest before police moved in to arrest him.
The witness said the knife looked to be about 30cm long and the ordeal lasted about 20 minutes.
‘‘Everyone was very scared and begging for somebody to stop the attack,’’ he said.
‘‘There was blood everywhere.’’
Parramatta police's acting Superintendent Jenny Scholz said the stabbing was not gang related and that it was an isolated incident between the two men.
"This was a targeted attack and Westfield's security and police responded immediately," she told media at a press conference on Monday afternoon.
"I understand here was a connection between the gentleman. We are trying to establish whether it was domestic related."
Police arrested a 33-year-old outside the Aquila Shoes store shortly after the stabbing.
It is understood the man, who has yet to be charged, ripped off his shirt and lit a cigarette before officers turned up to take him into custody.
Myer employee Bianca Zoratto-Ivanov said a friend of hers saw the stabbing close to the cosmetics section at the entrance of the store.
"He heard a scream, like a man yell," she said. "He heard it again and then he heard two young women scream: 'He's killing him! He's killing him!'
"That's when he turned around and saw the incident was taking place. He saw the man facing the store and doing the stabbing motions."
Zoratto-Ivanov said she knew the employee at Aquila Shoes who had seen the offender drive a machete into the victim.
"The man had a big machete," she said.
A witness told Macquarie Radio that a man started stabbing another man. He then lit a cigarette, took his shirt off and waited for police to arrive.
The man, who had a large tattoo across his back, was arrested a short time later, the witness said.
Confused and frightened shoppers were herded out of Myer, which has now been blocked off with tape on every level.
Police and Westfield staff are manning the blocked off areas, directing shoppers to the car park.
-Sydney Morning Herald, with AAP