The blaze started at about 9pm on Monday night, with police and fire and rescue crews called to attend a barn in Lowndes Drove. A spokesman for Cambridgeshire Fire and Rescue Service said: Firefighters arrived to find a barn containing 500 tonnes of straw well alight. Crews from Cottenham, Ely, Burwell, Papworth, March, Gamlingay, St Neots, Ramsey, Huntingdon, St Ives and Chatteris have been in attendance overnight. The water carrier and welfare unit have also been in attendance. Working in sections, firefighters used two hose reels and a jet to get the fire under control and protect nearby buildings. The crews have now scaled down, and one fire engine is in attendance. The cause of the fire is under investigation, the spokesman confirmed.