Raves at a nature reserve on the Yatton/Congresbury border are to be investigated.

There are reports people are holding late night parties at Cadbury Hill and leaving rubbish behind when they leave. 

It's thought barbeques have been held at the Iron Age fort leaving areas of charred grass and broken bottles have also been found at the site.

There are fears late night parties at a nature reserve on the Yatton/Congresbury border could have long term impacts. 

During the recent warm weather, people held barbeques at Cadbury Hill leaving behind charred grass and broken bottles. 

And it's feared the archaelogical importance of the iron age fort could be damaged if the parties continue.