Cambridgeshire Fire and Rescue Service said it was unknown how the blaze, which started at Holme Fen Nature Reserve, last Thursday, took hold. A crew from Stanground was called shortly before midday and found a peat fire about 30m by 30m in size. The crew spent about four hours on site working around the fire in an attempt to stop it spreading and it was agreed a further tactical plan would be arranged the following day. At 9am on Friday (14) fire officers met with site managers from Natural England, which runs the reserve, to develop a plan to manage the fire. Station commander Mick Jackman said that the roots of about 20 birch trees had burnt away in the blaze, causing them to collapse. Mr Jackman said: We deployed our specialist high volume pump and hose layer to the scene and set up equipment to pump a large amount of water from a nearby lake onto the fire. We also used hose reels and peat branches.