More than 500 bales of hay have been set on fire overnight in London Colney.

Firefighters were called to Willows Farm in London Colney shortly after midnight, after approximately 400 bales of hay were set alight.

While St Albans fire service was attending the blaze, another 100 bales were set on fire in Red Well Farm in Potters Bar.

Hertfordshire police attended the second incident but a police dog was unable to track the culprits.

Andrew Wolfe, chief executive at Willows Activity Farm, said: "Thankfully no one was hurt in the fire and all the animals were moved and are safe and well, however the fire has damaged all straw and hay stored for the winter feeding of animals.

"No buildings or facilities have been affected and Willows Activity Farm continues to operate as normal and is open for visitors.

"The police are studying CCTV footage as part of their ongoing investigations into the cause of the fire.

"Anyone with information that could help the police with their enquiries should contact them directly and we thank our customers for their concern and their ongoing support."

Fire crews remain at the scenes and an investigation is underway to find out who started the fires.