Please help to identify litter louts

I received this message yesterday:

Rubbish left at the rocks by a group of boys and girls this afternoon. Same lot that left rubbish last year. One lad had a bike. This is the rocky area at the back to the caravan park.

If the group could please go back, collect their litter and dispose of it in a bin or take it home to dispose it please ?

Not only is it unsightly, it can effect wildlife, and disrespecting our environment.