no comment.. ;((CNN) -- The Al-Jazeera TV network says it has received a videotape allegedly showing the killing in Iraq of one of a group of four Italian hostages.
The group says the other three hostages also will be killed if their demands are not met, the TV station said.
In a statement which Al-Jazeera says was delivered with the tape, the hostage takers, calling themselves "The Mujahedeen Brigade," blame Italian Prime Minister Silvio Berlusconi for the fate of the hostage.
CNN has not seen the tape and has no way of determining if it is authentic.
The Italian government has said it has no confirmation of the killing.
"We hope it's not true," said Foreign Minister Franco Frattini on Italian state television Wednesday.
Al-Jazeera said it did not broadcast the tape because it was too graphic.