Some type of scuffle broke out, and one person — likely a student — wound up on the ground, bleeding from an apparent stab wound, according to video from the scene.

What started as a peaceful protest turned bloody in Los Angeles, as a group of students walked out of school for the fourth day to protest immigration policies set forth by President Donald Trump. Images taken by KTLA’s Sky 5 helicopter over downtown L.

The large group, calling for a National Day of Action, could be seen through aerial footage walking in the middle of Spring Street, moving along to block an intersection at Chick Hearn Court and 11th Street all the while waving Mexico flags and carrying protest signs.