Another member of the Islamic Movement of Nigeria (IMN) has lost his life in detention due to the lack of medical care, the movement has announced.

According the a statement released by the movement on Friday, Abbas Isiyaku had been shot and injured in an attack by the Nigerian army in the city of Zaria in the northern province of Kaduna in December.

On December 12, Nigerian soldiers attacked Shia Muslims attending a ceremony at a religious center in Zaria, accusing them of stopping the convoy of the army’s chief of staff and attempting to assassinate him. Dozens of people lost their lives in the deadly assault.

“There are some other 13 critically wounded members of IMN still in the prison in Kaduna, Nigeria, alone,” the statement further said, adding that a large number of others, including the country’s prominent Shia cleric, Sheikh Ibrahim al-Zakzaky, and his wife, were still being held incommunicado at different military barracks and other prisons without access to medical attention.

Zakzaky has been in police custody since Nigerian forces raided his home on December 13 and arrested him after reportedly killing those attempting to protect him, including one of the movement’s senior leaders and its spokesman.

Earlier on Friday, hundreds of people staged a peaceful demonstration in the northeastern city of Gombe to express outrage at Zakzaky's detention and show solidarity with him. They also demanded the immediate release of the incarcerated leader. A similar protest was also held in the northwestern city of Sokoto.

Both incidents, the Zaria’s massacre and raid on Zakzaky’s home, led to the deaths of hundreds of members of the religious community, including three of Zakzaky’s sons. According to the UK-based Islamic Human Rights Commission, the death toll stands at over 1,000.