Hundreds of Palestinian prisoners in Israeli jails are joining a fellow inmate on hunger strike, after human rights groups reported that his life was in danger.

Khader Adnan has been refusing food and water since he was detained on December 17, without trial or charge.

His hunger strike, longer than any Palestinian prisoner before him, according to Palestinian officials, is in protest over what he calls his unjust detention and mistreatment by Israeli authorities.

Al Jazeera's Cal Perry reports from Jerusalem.