To sweeten their first day at primary school German children are normally given a cardboard cone filled with sweets, but school children in Essen this year opened their cones to find pens which project erotic images.

Children attending the Adolf Reichwein School in the north-western German city were handed cones containing the pens by members of the German Communist Party, according to the school's headmaster.

Angry parents who discovered that the pens given to their six-year-old children could project erotic images of women informed the headmaster.

In a press release the German Communist Party stated that it had purchased the pens from a discount store, which had said the pens lit up at the push of a button.

"The German Communist Party deeply regrets what has happened and is outraged that this kind of thing, which borders on pornography, can be purchased in normal shops," it said, adding that its lawyers were now investigating whether the vendors could be prosecuted.

The party has offered to exchange the pens for something more suitable for children.

- Reuters