Paula Kassig has used Twitter in an attempt to reach the head of the Islamic State fighters and appeal to Abu Bakr Al Baghdadi to release her son.
Abdul-Rahman Kassig - originally named Peter by his parents - had started a relief foundation to help Syrians fleeing the ongoing fighting when he was captured by the Islamic State jihadis.
Last week, Paula Kassig and her husband posted a video begging for their son's release.
IN: "Most of all...
OUT: ...let you go."
DUR: 26
***