Merseyside Fire and Rescue says the incident has been divided into sections in order to deal with the fire.
Part of the roof of the building has collapsed and a large number of tyres are involved in the fire.
The nearby Pilkington's factory has been evacuated but emergency services say it is not currently affected by the fire.
Residents are being advised to keep doors and windows shut until further notice.
Parents across St Helens say they're worried for their children's safety after proposals to cut funding for crossing guards - or lollipop men and women to many - were announced.
The council say it's because they have to make millions of pounds in savings in the face of what they describe as 'unprecedented financial challenges'.
Tim Scott reports from a school in Rainford, who look set to lose their lollipop lady.
Merseyside Police are becoming increasingly concerned for the whereabouts of 14-year-old Reece EvansRead the full story ›
A speeding driver been jailed after a hit-and-run crash which killed a four-year-old girl in Merseyside.Read the full story ›
A man has been bailed in the investigation into the murder of a man in St Helen.
Ryan Lamb, 20, was stabbed in an attack behind a pub on Canal Street on Sunday. Two other men were also hurt in the incident.
Police say a 21-year-old man from Huyton, who was arrested on suspicion of assault, has been bailed pending further enquiries. Two others were previously released on bail.
A man has pleaded guilty to causing the death by dangerous driving of a four-year-old girl on Merseyside.Read the full story ›
Police have confirmed a man stabbed in St Helens on Sunday has died in hospital.Read the full story ›
A man is critically ill in hospital after being stabbed in St Helens.
It happened behind a pub on Canal Street. Two other men were also injured. Their conditions are described as stable. Police say three people are under arrest and are appealing for information.
Bridge Street in St Helens is closed in both directions closed due to a 'police incident' between Water Street / Chalon Way and Ormskirk Street.
The closure is also affecting : Canal Street in both directions between A58 Linkway West / Chalon Way (Cineworld Traffic Lights) and Bold Street;.
Bold Street in both directions between Canal Street and Liverpool Street; and Liverpool Street in both directions between Bold Street and Liverpool Road.
St Helens prop Kyle Amor has been charged with a grade B offence following his sending-off in the Good Friday derby at Wigan.
Amor was shown a red card just 12 minutes into Saints' 29-18 defeat for a high tackle on Wigan winger Liam Marshall, who went on to score two second-half tries.
Acting Saints coach Jamahl Lolesi blasted the decision, insisting it was not a red-card offence and criticised referee Ben Thaler for failing to consult video official Phil Bentham before taking action.
The Rugby Football League's match-review panel has decided the tackle was careless, conceding that the initial contact was made with the ball/player's chest, and charged Amor with a grade B offence, which carries a one to two match suspension.
If Amor exercises his option to submit an early-guilty plea, he will receive a one-match ban, otherwise he will face a disciplinary hearing on Wednesday.
The former Leeds and Wakefield forward has been included in St Helens' 19-man squad for Monday's home game against Betfred Super League leaders Castleford.