A teenager who fatally stabbed a competitor at a Texas high school track meet was upset immediately after the confrontation and said he had warned the victim “not to touch me,” a witness testified Monday as a trial entered a second week.

Racial divisions around the case have propelled it to the national forefront, with the Black teen accused of killing a white fellow high schooler.

Lawyers for a young man who fatally stabbed a competitor at a Texas high school track meet are calling more witnesses as a trial enters a second week.