CBS 58MILWAUKEE (CBS 58) -- An 11-year-old is in custody after allegedly stabbing a 15-year-old during an argument Monday night, Aug. 10. Milwaukee Police are investigating the stabbing which they say happened in the area of Port Washington and Vienna avenues at around 8:22 p.m. The 15-year-old victim was transported to a local hospital to be treated. The circumstances that led up to the stabbing are still being investigated. The 11-year-old suspect was taken into custody.