The Department of Corrections and the Bronx District Attorney’s office have launched an investigation into the brutal attack of a Rikers Island inmate that took place earlier this month, New York 1 reports.

Inmate Dusetree Taylor, who was transferred from an upstate prison to Rikers Island early this month to attend a court hearing, ended up in the hospital after being violently attacked by an inmate in the cell next to him.

Now investigators have decided to launch a formal investigation into the incident, telling New York 1 that Taylor’s attacker was the same inmate who beat up Taylor during an earlier court-related visit to the Bronx in May, and that the two should never have been placed in cells next to each other.