The fires which have been sweeping across Saddleworth Moor could last for weeks unless there's a significant spell of rain.
That's the warning from the Greater Manchester Fire and Rescue service on day 5 of the emergency.
Union says the growing risk represents "another strain on dwindling resources."
The massive moorland fire in Saddleworth is now being investigated as arson.
More than 100 firefighters from Greater Manchester Fire and Rescue Service are continuing to battle against 'unprecedented' moorland fires.