INDIANAPOLIS (AP) – Supporters of an Indiana aid worker threatened with beheading by the Islamic State group are planning a vigil to pray for his safety.

The Wednesday evening vigil in Indianapolis for 26-year-old Abdul-Rahman Kassig is being hosted by the Muslim Student Association at Butler University, where he was once a student.

Organizers say members of Kassig's family will participate in the vigil, which will include readings from the Quran and speakers talking about his work providing aid for refugees fleeing Syria's civil war. 

The Islamic State group Kassig captive on Oct. 1, 2013. 

Ed and Paula Kassig say a former hostage told them their son converted to Islam voluntarily when he was sharing a cell with a devout Syrian Muslim. Their son was previously known as Peter Kassig.