Seattle police were called to the site of a stabbing in the 1500 block of Third Avenue shortly before 4:30 p.m. on Monday.
Medics took a man in his 30s with multiple stab wounds to Harborview Medical Center. A Seattle Fire Department spokesperson said that he was in critical condition.
Police said that he had been stabbed several times in the torso and that his injuries were life-threatening.
According to the police, the victim knew the man who stabbed him and the stabbing did not appear to be random.
The assailant remained at large. Police described him as a thin black man with medium skin, 20 to 25 years old and 5 feet 9 inches tall. He was last seen wearing a black baseball hat with a red insignia, a red shirt, a brown hooded sweater with black lettering and black pants.
Traffic was delayed on Third Avenue between Pike Street and Pine Street.