And militant Palestinian groups said they would not lay down their arms.
Various ideas for the form that such a government should take have been circulating among Palestinian groups in recent weeks.
The video is part of a now common genre with what the researchers said was a surprising message from a Palestinian group.
Military prosecutors have acknowledged that he is not a member of any illegal Palestinian group.
But none of the armed Palestinian groups claimed responsibility for the death.
Here is a guide to the main Palestinian groups and their leaders.
All the main Palestinian militant groups have called for his release.
A Palestinian group said only eight of its guerrillas were killed.
But Palestinian groups said the camp had been defunct for years.
There is also a lack of comprehension among the Palestinian groups.