22-year-old arrested on suspicion of arson over Winter Hill fire
In a statement, Lancashire Police said: "Lancashire Constabulary and Lancashire Fire and Rescue are carrying out a joint investigation into the cause of a fire at Winter Hill near Bolton.
"Fire crews continue to tackle the blaze which broke out yesterday afternoon (Thursday).
"The origin and cause of the fire remain unknown.
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Hide Ad"One man, aged 22, from Bolton, has been arrested on suspicion of arson with intent to endanger life."
Fire crews will work throughout the night to prevent a moorland fire spreading in Winter Hill, Lancashire Fire and Rescue said.
The service added 15 fire engines are on the scene after the blaze broke out on Thursday.