Police were warned that "somebody was going to get killed" amid “bloody chaos” as the Hillsborough disaster unfolded, Preston Crown Court heard.

Jurors were shown video footage taken on the day along with still photographs showing more and more fans descending on Hillsborough Stadium for the FA Cup semi-final between Liverpool and Nottingham Forest on April 15, 1989.

Audio from police radio was also played to the jury, during which warnings were made that people’s lives were in danger.

Match commander David Duckenfield is on trial accused of the gross negligence manslaughter of 95 Liverpool fans who died in a crush in pens three and four of the Leppings Lane terrace.

Sheffield Wednesday club secretary Graham Mackrell, is also charged with health and safety offences. The pair deny the charges.

Hillsborough Disaster 1989 Show all 8 1 /8 Hillsborough Disaster 1989 Hillsborough Disaster 1989 Liverpool fans try and pull their fellow supporters out of the crush at Hillsborough stadium, 15 April 1989. Ninety-six fans were crushed to death and hundreds injured after support railings collapsed during a match between Liverpool and Nottingham Forest Richard Sellers Hillsborough Disaster 1989 Football fans are rushed away on a stretcher at Hillsborough stadium, 15 April 1989. Ninety-six fans were crushed to death and hundreds injured after support railings collapsed during a match between Liverpool and Nottingham Forest AFP/Getty Hillsborough Disaster 1989 The Sun has been boycotted in Liverpool since this edition, which lied about the behaviour of Liverpool fans on the day Hillsborough Disaster 1989 Hillsborough Memorial tributes lie on the pitch during the memorial service marking the 25th anniversary of the Hillsborough Disaster, at Anfield Stadium on April 15, 2016 in Liverpool, England. Thousands of fans, friends and relatives attended the service at Liverpool's Anfield Stadium to mark the 25th anniversary of the Hillsborough tragedy. 96 Liverpool supporters lost their lives during a crush at an FA Cup semi final against Nottingham Forest at the Hillsborough football ground in Sheffield, South Yorkshire in 1989 Liverpool FC via Getty Images Hillsborough Disaster 1989 Barry Devonside leaves Parr Hall, Warrington, where the Crown Prosecution Service has said, Hillsborough match commander David Duckenfield, former chief constable Sir Norman Bettison and four other individuals have been charged with offences relating to the Hillsborough disaster. PA Hillsborough Disaster 1989 Family members react after the families of the 96 Hillsborough victims were told the decision that the Crown Prosecution Service will proceed with criminal charges and six people have been charged with criminal offences, including Ex-Ch Supt David Duckenfield and Sir Norman Bettison on June 28, 2017 in Warrington, England. The Crown Prosecution Service (CPS) revealed its intentions at a meeting with victims' relatives. Last year's inquests into the Hillsborough disaster concluded the 96 fans had been unlawfully killed Getty Images Hillsborough Disaster 1989 Norman Bettison was charged with four counts of misconduct in a public office. He was found to have lied on four separate occasions about his role in the deaths and when he claimed he never blamed Liverpool supporters for the disaster PA Hillsborough Disaster 1989 Former South Yorkshire Police match commander David Duckenfield is currently on trial for the gross negligence manslaughter of 95 Liverpool fans. Reuters

Edward Higgins, a police sergeant with South Yorkshire Police (SYP) told the jury he was in charge of 10 officers in Serial 20 inside the ground on the day, held in reserve until he was told to go to Gate A on Leppings Lane at 2.43pm.

He told jurors: "We had complaints of being crushed outside, due to the numbers of people. A lot of people were coming in complaining we should do something about it. They were coming in quite agitated, a few swear words, they wanted something done sooner rather than later.

"The gate was moving, the actual stone wall was moving literally, I thought the gate might collapse."

The retired officer said one female fan, told officers "somebody was going to get killed if nothing was done".

He added: "A woman was shouting, in a bright red top, was having a go at the officers and some other chaps pulled her away from us."

Court shows layout of stadium in David Duckenfield's Hillsborough trial

Mr Higgins said he asked his superiors for permission before telling a steward to open gate A, to let the fans in and relieve the crush outside.

Beforehand, he ordered his officers to form a line cordon to filter supporters as they came through.

He then received orders to go to the pitch side where he realised a numbers of fans were injured behind the perimeter fences of pens three and four on the terraces.

He added: "I know a couple of my serial went to the metal barriers and tried to pull them, a couple of my stronger lads tried to pull the barriers down, the perimeter fence."

Mr Higgins and his officers then began helping injured fans and took a fan to the stadium gymnasium which was converted into a makeshift morgue.

A statement from Alison Willis, read to the jury told how she could see a boy of 14 or 15, who appeared lifeless but pinned upright against the fencing.

She said she escaped from pen four with bruising to her ribs, arms and legs in the crush.

The trial continues.