MINNEAPOLIS — A Minneapolis high school has disciplined four students after a dark-skinned doll was dangled by its neck with a piece of string.

Minneapolis Public Schools said Thursday students recorded the incident that happened last Friday at Washburn High School. Images were posted on social media sites and also caught on school security cameras.

The district said it’s “deeply disturbed” by what it calls “an incident of racial intolerance.” The district said the four students were disciplined but didn’t say how, because of school privacy restrictions.

Washburn on Thursday canceled after-school activities, including a basketball game, because of safety concerns following the incident.

In a letter sent home to parents, Principal Carol Markham-Cousins said she took immediate action when she learned about the incident.