A 39-year-old construction worker has been arrested for throwing his own faeces at women passers-by from a motorcycle in two separate attacks in western Japan, police said today.

The man turned himself in yesterday after making the second drive-by attack in Settsu, a satellite city near Osaka, and was detained on suspicion of assault, a municipal police spokesman said.

The worker, identified as Tatsuya Moriguchi, committed a similar assault in the same city on August 3, the police official said.

"The suspect has told investigators he did it because he felt frustrated when his work didn't go well,'' the official said.

"I have no idea what kind of penalty he may face. I have not heard about such a case before.''

In the first incident, Moriguchi relieved himself outdoors just before getting on his moped and throwing the faeces at the head of a woman in her 20s, the official said.

