The incident began at around noon, when the woman was inside the Starbucks outlet at 5th Avenue and Pine Street. She threw a cup of coffee on one of the employees there, then ran out of the store and down the street, said Jonah Spangenthal-Lee of the Seattle police.
A security guard chased after the suspect and called police, who located the woman near 7th Avenue and Stewart Street.
When officers approached the woman, she pulled out a large kitchen knife and brandished it.
Police got the knife away from the woman, then discovered she had a small knife wound to her abdomen that appeared to be self-inflicted.
She was taken into custody, then wheeled to a waiting ambulance on a gurney.
The Starbucks employee who was hit by the coffee was not seriously hurt.
This is a developing news story. More information will be posted as it becomes available.