Greater Manchester Fire Service said tyres have caught light and are causing the billowing smoke across the area.
Three fire engines are at the scene, close to a railway line near Broughton Road, Salford.
Several people spotted smoke in the Salford area - we are dealing with a caravan on fire
Fire investigators at a house in Wirral where a woman died say the batteries had been removed from a smoke alarm.
A joint police and fire investigation is underway into the cause of the blaze at a house in Village Road, Higher Bebington.
We have found that there was a smoke alarm in the rear room on the ground floor of the property and the battery had been removed but we do not know when this took place. Our investigation is continuing.
Fire crews were called to the address shortly before 6pm on Sunday and during a search of the property the body of a woman was found.
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An investigation's been launched following a fire in Blackpool this morning . It broke out at the back of the Pit Stop Shop, Dunelt Road. Road closures were put in place on Bloomfield Road.
Two people were rescued by firefighters from the flat above the Shop and 25 people were evacuated from nearby flats. There were no injuries.
The building has been left badly damaged by the fire and an investigation is now underway to try to establish the cause.
Det Insp Gareth Willis, of Blackpool Police, said: “We now believe that this fire was started deliberately and I would appeal to anyone who has any information or anyone who has seen anything suspicious in the area at or after about 3am today to get in touch with us.”
Thousands of firefighters across the North West will go on strike later. They are taking part in industrial action across the country in a row over pensions.
Speaking on Monday the Chairman of Greater Manchester Fire and Rescue Service, Cllr David Acton, explained how they are prepared for the action.
More than 60 firefighters are tackling a blaze at Leyland St Mary's Catholic Technology College in Lancashire.
Crews were called to Royal Avenue at around 4pm today. Lancashire Fire and Rescue Service are treating the blaze as suspicious.
Around 20 firefighters are tackling a blaze at three properties in Rochdale this morning.
Crews got the call to War Office Road in Norden at just after 5am this morning to find three terraced houses alight.
Reports suggest there are two casualties although their condition is unknown.
Roads around the area are closed.
Parts of Manchester that have been closed since the death of a firefighter during a blaze have now reopened. Stephen Hunt died in the fire at a hairdressers on Oldham Street.