Jordan said yesterday 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 US-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 the exchange of prisoners

“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 said.

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. “We have not received any evidence that al-Kasaesbeh is alive. This is what we asked and have not received any proof,” Momani said.

A TV screen broadcasting a news programme about Islamic State hostages Jordanian air force pilot Muath al-Kasaesbeh (top right) and Japanese journalist Kenji Goto (top centre), along a street in Tokyo yesterday. Photos: Reuters

He said separately that Jordan was coordinating with Japanese authorities in an effort to secure the release of Goto, a veteran war reporter also being held by the radical Islamists.

Goto’s wife urged both governments to work for her husband’s release, saying in a statement to Reuters and other media that she feared this was his last chance. In the latest audio recording purportedly of Goto, he said that al-Kasaesbeh would be killed “immediately” if al-Rishawi was not at the Turkish border by sunset yesterday, Iraq time, ready to be exchanged for the Japanese hostage.

That was some time around 1430 GMT.

The implication that the Jordanian pilot would not be part of an exchange deal has left Jordan in a difficult position.

Any swap that left out the pilot would be deeply unpopular after officials insisted he was their priority, and could leave Amman subject to further demands from the militants.

But refusing the insurgents’ ultimatum could heighten domestic opposition to Jordan’s unpopular role in the US-led military campaign against Islamic State.