Tokyo authorities are searching for a mystery pooper who repeatedly has left feces in the same shopping district, a report said.

The male perpetrator known as “Mr. Poop” has reportedly relieved himself on the streets of the Akihabra district on at least 10 occasions over the last three months, according to the Tokyo Reporter.

In one incident, the mystery pooper, who is believed to be in his 30s, was caught with his pants down as he fled. His dropped trousers were black and he was carrying a blue backpack, witnesses said.

Nearby business owners are sick of his crap.

Kosaku Nakajima, a model train store owner, said he posted a sign to warn patrons about the repeat offender.

The serial pooper has marked his territory outside Nakajima’s store, as well as by two other buildings and in front of a utility pole, the news outlet reported.