A pensioner who dumped almost a quarter of a tonne of pornography in a Japanese park is unlikely to be charged, police said Tuesday, because the stash belonged to an ill friend.

Hideaki Adachi was spotted unloading 17 sacks of films and magazines, which included around 500 VHS video tapes, from the back of a truck at a small park in the western Japanese city of Osaka.

"He wanted to get rid of them out of goodwill for his friend," a spokesman said.

Adachi, who worked as a volunteer in the park helping homeless people, had hoped that the huge collection of adult materials would be picked up and taken to a proper disposal site.

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