More than 100 people attended an illegal rave in west Dorset which went on for more than seven hours.

Police were called to Lambert's Castle near Marshwood around midnight.

A spokesman for Dorset Police said that between 100 and 150 people attended the event at the National Trust site last Monday and it was resolved shortly before 8am.

Emergency services were called to the same area at 5.30am to reports of people in the road between White Gates and Lambert's Castle and an ambulance was called for a 17-year-old girl who required medical assistance.

A spokesman for South Western Ambulance Service said the girl was reportedly found unconscious. Paramedics treated her at the scene and transported her to hospital for further care. It is not clear whether she had attended the rave.

Some residents claim they were kept awake all night by the noise, while others raised concerns about mess and the impact on livestock.

One resident, who preferred not to be named and lives half a mile from Lambert's Castle, said they could hear 'pounding music all night.'

"It was still going strong at 6am," they said. "But I am more concerned about the damage they will have caused to such a stunning and historic site and the fear the poor livestock would have been put through.

"Why is this allowed to happen? Are the police powerless?"

Another resident said: "I live locally and just had to put up with the noise all night.

"Lambert's Castle is a special site of scientific interest, a hugely important and sensitive wildlife site. I just hope they have not caused too much damaged and have cleared up."

Lambert's Castle is a National Trust ancient hill fort off the B3165.

A tenant of the site said they rang the National Trust at 6.30am and 'they knew nothing about it'.

"They [the National Trust] said they had no reason to move them on as they had no done anything wrong," said the tenant. "The hill is open to the public."

Angel Goldman attended the rave and said she was 'genuinely overwhelmed' by 'positive and understanding feedback' from locals and police.

"We always try our hardest to leave locations as we find them," said Angel. "And, as a community, we all chip in to help achieve this.

"A local councillor arrived with his camera on a mission to photograph the devastation us party people had left on the beautiful nature reserve of Dorset. However, he approached us last few stragglers and praised us for the thoughtfulness of our acts.

"Our aim is to never create mess, trouble or disturbance for anyone. We were so genuinely happy with the warm reception and level of respect we received from everyone in the surrounding area, including the police, that all we can do is say 'thank you Dorset for letting us express and celebrate in the best possible way.'"

A Dorset Police spokesman said officers from Devon and Cornwall Police attended, liaised with event organisers and, following negotiation, requested they turn the music down.

They attended the site on Monday morning and confirmed the event had ended shortly before 8am.

The National Trust has been contacted for a comment.