Japanese police have arrested a man accused of bursting into a lawyer's office and cutting off his penis with garden shears before flushing the organ down a toilet.

Local media reports said Thursday that Ikki Kotsugai, a 24-year-old Tokyo graduate student, may have been acting out of revenge over his wife’s romantic involvement with the 42-year-old victim with whom she worked.

Police said Kotsugai, who was arrested shortly after the alleged attack, burst into the lawyer's office in Tokyo's Minato Ward at around 7:40 a.m. Thursday. He punched the unnamed lawyer several times before prying off his pants and then severing his "lower body part" with the shears.

Kotsugai told police that he flushed what was severed down the toilet.

A Tokyo police spokesman confirmed the body part in question was the man’s genitals.

© (c) 2015 AFP