Purported ISIS message sets new deadline for prisoner handover

A message purporting to be from the Islamist terror group sets a new deadline for a possible deal with the Jordanian government.

The latest demand: Bring convicted terrorist Sajida al-Rishawi to the Turkish border by sunset Thursday, or Jordanian ISIS hostage Moaz al-Kassasbeh will be executed "immediately."

But is ISIS offering anything in return?

From the latest message, it's unclear. But previous video posts purportedly from ISIS have suggested the group was offering Japanese hostage Kenji Goto's freedom in exchange for al-Rishawi's.

CNN could not independently confirm the authenticity of the latest message, which was read by a person claiming to be Goto and posted online by ISIS supporters. In the message, Goto purportedly calls for al-Rishawi's release in "exchange for my life."

Goto, an experienced Japanese war journalist, has been at the center of several threats by ISIS since his capture. Last week, the group demanded $200 million from Japan in exchange for Goto and fellow Japanese hostage Haruna Yukawa, an aspiring security contractor. Since then, ISIS has claimed Yukawa is dead, but Goto is still alive.

Al-Kassasbeh, a Jordanian pilot, was captured by ISIS last month after the fighter jet he was flying crashed in Syria. ISIS says he's still alive, but Jordan's foreign minister told CNN his government has asked for a proof of life, but hasn't received it.

Al-Rishawi is an Iraqi prisoner on death row in Jordan for her role in 2005 bombings. ISIS has demanded her release by sunset Thursday (5:30 p.m. in Mosul, Iraq; 9:30 a.m. ET). Jordan has said it's willing to swap al-Rishawi for the Jordanian pilot.

(CNN)