A plaque has been unveiled in memory of two firefighters who died following an explosion at a Sheffield steel plant.

Bob Smith, 47, and Paul Parkin, 27, died from injuries sustained in the blast at British Steel Corporation's Tinsley Plant on 25 February 1974.

Their story was a "vital part of local history and the history of the fire service", the Fire Brigades Union (FBU) said.

The tribute was unveiled at Parkway Fire Station in Sheffield in a ceremony attended by serving and retired firefighters and family members.

A total of 13 firefighters were injured in the explosion, which was heard more than half a mile (0.8km) away and was triggered by a fire caused by leaking molten metal.

Mr Smith, who had served with the Sheffield Fire Brigade for 23 years, died three days after the explosion. His colleague died several weeks later on 28 March.

Alex Wilson, FBU's South Yorkshire brigade organiser, said both firefighters had shown courage and dedication.

He said the area around the plaque was a "place of reflection and remembrance" for the local community and future generations of firefighters.

"We will always remember Bob Smith and Paul Parkin, and their service to the people of Sheffield," Mr Wilson added.

The red plaque scheme, which started in 2017 and is run by FBU volunteers, honours firefighters who have died while in service. It is funded by the Firefighters 100 Lottery.