The last of the revellers did not leave until lunchtime on Monday

Police say around 300 people gathered for last weekend's unlicensed event.

A police officer suffered an eye injury after being hit by a missile, said North Wales Police.

But some ravers have claimed the police used excessive force when they moved in on the group and that some people had their photographic equipment smashed.

Skirmishes broke-out, the crowd grew hostile and individuals in the crowd started to throw missiles North Wales Police

A force spokeswoman said the party started in the early hours of Saturday in the car park at Whistling Sands, near Aberdaron.

"Incidents of damage, noise from the sound system and high powered lights from the stage were reported," she said.

"Police attended the scene and the organiser of the event was given a direction under section 63 of the Criminal Justice and Public Order act 1994 to quit the land by noon on Sunday.

"It was apparent after the deadline that the police direction was being ignored and officers attended the car park with a view to upholding the law.

"Skirmishes broke-out, the crowd grew hostile and individuals in the crowd started to throw missiles.

Police helicopter

"One officer received a serious eye injury which has resulted in him being hospitalised in Ysbyty Gwynedd, Bangor."

At 0800BST on Monday officers wearing full protective clothing and supported by the police helicopter returned to the site.

"By this time the National Trust beauty spot was strewn with litter and rubbish," added the spokeswoman.

"Police quickly took control of the site and a few minor skirmishes were soon quelled.

"During the morning those attending the rave gradually left the site with the last leaving about 1300 BST."

'Effective and efficient'

Deputy chief constable Clive Wolfendale said: "People have made a disgusting mess of a very beautiful part of the Llyn Peninsula.

He said North Wales Police officers had dealt with the rave effectively and efficiently.

But Lee Nailor, 22, from Reading, whose said his van was impounded by police, said the force had failed to notify the majority of people attending the event of the section 63 notice.

He said there was no stage or high-powered lights at the event.

He said: "Police stormed the site from front and back in a very forceful manner, attacking whoever was in their way without any warning.

"They stopped us from tidying up, in a threatening manner, and said it was evidence and not to be disturbed.

Police statement

"Police were seizing people's video cameras and photographic equipment. A lot of people's cameras got smashed up."

The BBC newswebiste put Mr Nailor's allegations to North Wales Police.

In a statement, a spokeswoman said: "This was a serious incident in which a number of officers were hurt and one remains in hospital.

"We are still appealing for witnesses and anyone with information is asked to contact North Wales Police.

"We have a team investigating the incident."