Nikolas Cruz, the man accused of killing 17 people at Marjory Stoneman Douglas High School in February, is facing allegations of repeatedly punching a jail guard before taking his stun gun in a fight.

The alleged mass killer is awaiting charges related to the mass shooting in Parkland, Florida earlier this year, where 14 students and three administrators were killed when police say he opened fire with an AR-15.

A police report on the most recent incident indicates that the Cruz had been told not to drag his sandals on the ground while walking around in the dayroom area of the jail holding him. Cruz became agitated by the order, flipped off the officer, and then struck him in the face, according to the report.

He then struck him on the top of his head with his fists, and then grabbed the stun gun, which is known as a “conductive electronic weapon”.

During a scuffle between the two, the weapon discharged. Cruz then repeatedly hit the officer until the official was able to regain control of the weapon and strike the inmate in the face, according to the report. The alleged killer then retreated to a seat, where he was taken into custody.

Cruz waiting for his trial after what was the deadliest mass shooting at a high school in recent history. The 20-year-old faces a potential death sentence should he be convicted on the 17-counts of first-degree premeditated murder, and 17 counts of first-degree attempted murder.

Florida shooting – in pictures Show all 10 1 /10 Florida shooting – in pictures Florida shooting – in pictures Police arrest a suspect in connection with the shooting at the Marjory Stoneman Douglas High School in Parkland, Florida Reuters Florida shooting – in pictures Parents wait for news after reports of a shooting at Marjory Stoneman Douglas High School in Parkland, Florida AP Florida shooting – in pictures Anxious family members wait for news of students AP Photo/Wilfredo Lee Florida shooting – in pictures Students being evacuated from the school AP Florida shooting – in pictures Students being evacuated from the school Getty Florida shooting – in pictures People gather waiting for word from students AP Florida shooting – in pictures Parents waiting for news on their children AP Florida shooting – in pictures People gather at a hotel where students were taken after the shooting Getty Florida shooting – in pictures Florida Governor Rick Scott speaks to the media as he visits Marjory Stoneman Douglas High School following the shooting AFP/Getty Florida shooting – in pictures Dr. Igor Nichiporenko, Medical Director Trauma, left, and Dr. Evan Boyer, Medical Director, Emergency Services, speak about treating victims and the suspect at a press conference outside Broward Health North hospital AP

Cruz’s attorney has described his client as a “deeply disturbed, emotionally broken” young man. The alleged shooter himself told a police detective that he had a “demon” in his head, according to interview records.