Nikolas Cruz, the man suspected of fatally shooting 17 people at a South Florida high school in February, has been accused of attacking a guard Wednesday morning inside the jail where he is awaiting trial, according to a local report.

The Broward County Sheriff’s Office told NBC 6 the 20-year-old was involved in an incident with a detention deputy at Broward County Jail. The unnamed deputy was injured, though it’s not clear how Cruz may have attacked the law enforcement officer.