An illegal rave took place in Thetford Forest over the weekend close to an area designated for great crested newts, a European protected species.
The unlicensed music event left a quite a clearing-up task for rangers in the Croxton Heath area of the forest.
At the moment it is not known if there is any damage to the newts' breeding site - the animals and their eggs, breeding sites and resting places are protected by law.
A Forestry Commission spokesperson said: 'We are aware of an illegal rave taking place on our land in the Croxton area on Saturday night.
'The gate locks were broken to gain access and the rave was adjacent to an area designated for great crested newts.
'We are assisting the police with their investigation.'
Norfolk police were called at 12.50am on Sunday, August 20 and officers monitored the event using a drone unit.
By 8pm on the Sunday all vehicles and people had left.
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