Anthony CarrollA major blaze at an old warehouse in Martham, near Yarmouth, is being treated as arson.The news of the arson investigation at the former cash and carry building in Hemsby Road came as fire crews were called out on Tuesday to deal with the remnant of last week's fire.Anthony Carroll

A major blaze at an old warehouse in Martham, near Yarmouth, is being treated as arson.

The news of the arson investigation at the former cash and carry building in Hemsby Road came as fire crews were called out on Tuesday to deal with the remnant of last week's fire.

Thursday's night blaze caused billowing clouds of smoke containing deadly asbestos to travel thorough the air - leading to families being told to stay indoors.

Because of the scale of the damage from Thursday's fire, fire fighters have been unable to enter the premises to make it safe - leading to Tuesday's call out.

At about 6am two engines from Martham and Acle tackled a fire caused by the smouldering remains of some foam insulation in the building.

Even though fire investigators can not gain full access to the site, they suspect that last week's fire was started by an arsonist.

Norfolk Fire and Rescue Service group manger Richard Herrell said: 'We have reason to believe it was deliberate. The nature of yesterday's fire is linked to part of Thursday's incident.

At the height of Thursday's fire there were 70 firefighters tackling the flames, which lead to police closing off roads and advising people living nearby to stay indoors.