An innocent man was killed after confronting a gang of drunken youths who were causing mayhem on an industrial site.
Robert Wilson, 53, who worked at Thornton and Ross, was attacked at the Manchester Road site by several people .
Another man, believed to be a colleague, 39, suffered serious injuries and was rushed to Leeds General Infirmary where he is currently being treated.
Witnesses heard high pitched screams as the brutal attack was carried out at about 11.45pm on Thursday.
Many have reported that the victims were stabbed but this has not been confirmed by West Yorkshire Police.
A large number of police and ambulance crews flooded the area in response to the attack.
CPR was carried out at the scene but Mr Wilson, from Birstall, died from his injuries.
Police have confirmed five arrests have been made with one woman and four men being held on suspicion of murder and attempted murder.
A friend of Mr Wilson said his family were too upset to speak today.
CCTV shown to ExaminerLive showed a group of youths drinking near the scene before they entered the Thornton and Ross site.
Two are later seen running from the site across Manchester Road.
Witnesses described the horror of the aftermath of the attack.
One woman, who lives nearby, heard a horrifying scream just before police arrived and saw a man lying on the floor in a car park next to the Thornton and Ross facility.
She said: “I heard someone screaming, it was horrible.
“It was about 11.45pm. I thought ‘god it sounds like someone is killing someone.
“I heard high pitched screaming and then saw blue lights. There was one guy on the floor and people standing over him.
“More and more police arrived and the helicopter arrived.”
The woman continued: “The police were frantically searching, presumably for the culprits responsible for the guy on the floor.
“More than 10 officers were searching the premises of Thornton and Ross.
“As this was going on I could see a drip being held by one of the officers as paramedics were performing CPR. After many minutes CPR ceased.”
A cordon was in place all day on Friday and staff weer told that the site would be closed until Monday.
Forensic officers were working at the site with a blue tent erected within the cordon.
Another witness said: “What’s happened is absolutely sickening. I am sick for the guy.”
And another resident agreed, they said: “It is sickening. I heard someone came to help the guy who was stabbed and they were attacked.”
A second police cordon has been put up around the shop this morning and a police car is blocking the entrance to the shop’s car park.
Four men and one woman are currently in custody, being questioned by West Yorkshire Police on suspicion of murder and attempted murder.
Assistant Chief Constable Mark Ridley of West Yorkshire Police, said: “This has clearly been an extremely serious incident and the investigation is in its early stages to determine exactly what has taken place.
“We have arrested five people in connection with the attacks on both men and they remain in custody for questioning.
“I wish to thank witnesses who have come forwards so far and I would appeal to anyone who has information or footage showing the incident or persons behaving suspiciously on the road just prior to it taking place to contact us.
“Increased patrols are being conducted in the area by local neighbourhood policing team officers and I want to reassure residents that a full range of resources has been deployed to investigate what has taken place.”