An Arizona prisoner serving 16 life sentences killed three other inmates at a state prison in Tucson, according to officials.

Ricky Wassenaar is accused of killing Saul Alvarez, Thorne Harnage and Donald Lashley during the altercation on Friday at the Arizona State Prison Cimmaron Unit, according to KOLD.

Wassenaar is the only suspect in the incident, the outlet reported. Prison officials say he acted with “intent to harm.”

Prison officials say Wassenaar acted with “intent to harm.” (iStock)

“ADCRR’s Office of the Inspector General has begun an initial criminal investigation related to the inmate’s deaths,” prison officials said in a statement. “All inmate deaths are investigated in consultation with the county medical examiner’s office. The ADCRR takes situations involving violence seriously and will pursue prosecution against any suspects believed to be involved in the case.”

Visitations at the prison were canceled for the rest of the day on Friday following the altercation.