ISIS extends deadline

(CNN)—Could a prisoner handover spare the lives of two ISIS hostages?

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."

It's the latest twist in a complicated crisis with dizzying develop