AMMAN — Jordan said on Thursday it was still holding an Iraqi would-be suicide bomber as a deadline passed for her release set by “Islamic State” militants who threatened to kill a Jordanian pilot unless she was handed over by sunset.

An audio message purportedly from a Japanese journalist also captured by the insurgents said the pilot would be killed unless Jordan freed Sajida al-Rishawi, who is on death row for her role in a 2005 suicide bomb attack that killed 60 people in Amman.

The message postponed a previous deadline set on Tuesday in which the journalist, Kenji Goto, said he would be killed within 24 hours if Rishawi was not freed.

The hostage crisis comes as “Islamic State”, which has already released videos showing the beheadings of five Western hostages, is coming under increased military pressure from U.S.-led air strikes and by Kurdish and Iraqi troops pushing to reverse the Islamist group’s territorial gains in Iraq and Syria.

About an hour before the new deadline was due to pass, government spokesman Mohammad al-Momani said Jordan was still holding Rishawi.

“We want proof … that the pilot is alive so that we can proceed with what we said yesterday — exchanging the prisoner with our pilot,” Momani told Reuters.

The pilot, Muath al-Kasaesbeh, was captured after his jet crashed in northeastern Syria in December during a bombing mission against “Islamic State,” which has seized large tracts of Syria and Iraq.