The alleged kidnappers of BBC Gaza correspondent Alan Johnston have denied that they have reached a deal announced by Hamas for his imminent release.
Alan Johnston was abducted at gunpoint in Gaza on 12 March
In a video shown on al-Jazeera TV, a masked man said to be from the Army of Islam said there were "developments" in meetings with Hamas.
But he maintained that the reporter could still be killed if their demands were not met.
The BBC said it was aware of the video and was watching developments closely.
Mr Johnston, 45, was abducted on 12 March in Gaza City on his way home.
Militants purportedly belonging to the Army of Islam posted a video on the internet on 1 June showing the first pictures of the reporter, in which he said he was being well treated.
Mr Johnston was the only Western reporter permanently based in Gaza and his abduction has triggered appeals for his release from lawmakers and rights groups around the world.
More than 160,000 people have now signed an online petition calling for his release.
In the video shown on 17 June, the masked spokesman repeated demands for the release of Islamist prisoners, in particular Palestinian-born cleric Abu Qatada, who is detained in the UK.
"There are developments and we will let you know when there are new developments," he said.
"...If they do not meet these demands there will be no release of this prisoner, but if things get worse we will get closer to God by killing this journalist."
The video was shown hours after a Hamas representative said Mr Johnston would be released soon.
Speaking at a news conference in the Iranian capital, Osama al-Mouti said Hamas was trying to secure his freedom without meeting the group's demands.
He said if Mr Johnston was not freed soon, it would only be because of concerns for his security.
On Friday, Hamas said it would no longer allow the journalist to be held captive and that it was in contact with Mr Johnston's abductors.