Human rights organization Amnesty International is calling for the release of Professor Leonzio Angelo Onek, Dean of the College of Applied and Industrial Sciences at the University of Juba.

The rights group says that Prof. Leonzio Angole Onek should either be charged and presented before a competent judicial authority or immediately released.

Leonzio was arrested on 7 December 2015 at around 4pm while driving from the University of Juba campus to his home in the University’s faculty compound. Two beige vehicles carrying six National Security Service (NSS) officers blocked his car on the road.

According to Amnesty, three of the officers, one of them armed with an AK-47, pulled him out of his car, handcuffed him and drove him to the NSS headquarters where he is currently being held “without access to his family or a lawyer.”

“The NSS have not charged Prof. Leonzio Angole Onek or disclosed any reason for his prolonged arbitrary detention,” reads a statement from the human rights group.