FAIRFIELD, N.C. (WNCT) – All inmates from the Hyde Correctional Institution have returned from the hospital after 10 of them were transported to various hospitals since Wednesday with symptoms consistent with substance abuse or a drug overdose.

Three inmates were removed from medical facilities late-Friday evening, and one more was let go on Friday.

Members of the Prison Emergency Response Team searched Hyde Correctional Institution and found small quantities of K2. Officials are currently investigating into the source of the drugs.Previous Story on 5/14/16: 

Ten inmates at Hyde Correctional Institution were hospitalized after a suspected overdose.

One inmate was airlifted to Vidant in Greenville and the other four were taken by ambulance to the hospital Friday. This is in addition to five other inmates who were hospitalized after experiencing the similar symptoms one Wednesday.

Four of the inmates have returned to Hyde CI, but on remains hospitalized. After Wednesday’s incident, a thorough search of the prison was conducted but no drugs were found.

Officials think the drug might have been K2, also known as Spice, which some people call synthetic marijuana. It can have stronger effects on the brain than marijuana.

Hyde Correctional Institution in Hyde County is a men’s medium and minimum security prison that has space for almost 750 inmates.