Officers were finishing up some paperwork at about 11 a.m. when someone alerted them to a fire in the alley outside, according to police.
When they went outside to investigate, officers found a man standing next to a burning paper bag in the alley just west of 12th Avenue and Pine Street.
After putting out the fire, police began questioning the 31-year-old man who was standing next to it. He quickly admitted to starting the blaze, saying he had "taken a (poop) and was trying to burn the (poop) away," according to police.
The man also pleaded ignorance that it was against the law to burn bags of feces behind police stations.
Officers arrested the man, who has not been named, and booked him into King County Jail for reckless burning. Police say a Seattle Fire Department crew "mercifully came and hosed down the alley."