An investigation is underway to find out how 52 trailer units ended up on fire last night in Peterbrough, requiring more than 50 firefighters to extinguish the blaze.

Cambs Times: Five teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIREFive teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIRE (Image: Archant)

Crews were called to the site of the former Pedigree Petfoods site at the rear of Hotpoint on Shrewsbury Avenue at around 6.57pm.

Temporary road closures were put in place in Shrewsbury Avenue, Morley Way and Celta Road up to the junction with the A15.

There were no casualties.

Cambs Times: Five teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIREFive teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIRE (Image: Archant)

Members of the public were urged to avoid the area and local residents are advised to keep doors and windows closed.

Crews from Whittlesey, Dogsthorpe, Stanground, Yaxley, March, Sawtry, Wisbech attended the incident, along with a crew from Spalding, Lincolnshire Fire and Rescue Service.

The incident command unit from Huntingdon, water carrier from Ramsey, HVP supported by firefighters from Papworth and Gamlingay, a water carrier from Newmarket, Suffolk Fire and Rescue Service, the incident support unit from St Neots and a water carrier from Fakenham, Norfolk Fire and Rescue Service also attended.

Cambs Times: Five teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIREFive teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIRE (Image: Archant)

Police and ambulance crews were also in attendance.

The cause of the fire is under investigation.

Cambs Times: Five teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIREFive teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIRE (Image: Archant)

Cambs Times: Five teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIREFive teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIRE (Image: Archant)

Cambs Times: Five teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIREFive teenagers have been arrested on suspicion of arson following a blaze at Hotpoint in Peterborough which saw 48 trailers go up in flames, causing around £2million worth of damage. Picture: CAMBS FIRE (Image: Archant)