Egyptian police said they found a decapitated head in Sinai on Friday of a man kidnapped by Islamist militants, reportedly for his role in assassinating an extremist.
A security official said another man, also accused in the assassination, was believed to have been kidnapped by the Bedouin militants.
Bedouin tribal sources said the head found in the Muqatta area in north Sinai belonged to Manazil Bereikat from the same tribe of an extremist killed in a mysterious explosion near the Israeli border on August 26.
At the time, witnesses said the militant, Ibrahim Ouda Bereikat, died in a blast as he tried to fire a rocket into Israel. Security sources said he might have been killed by a landmine.
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Ouda Bereikat was believed to have taken part in several rocket attacks against Israel. The militants, and his family members, believe his assassins worked with Israel and said Manazil should not be given a Muslim burial.
"No one is willing to touch the body, he will not be buried, even his relatives don't want to bury him," said another Bedouin source.
The security official said two other men the militants were hunting to avenge Ouda Bereikat's death fled across the border into Israel.
The Egyptian military and police have bolstered their presence in the lawless peninsula to battle Islamist militants after gunmen killed 16 soldiers at a border outpost on August 5.
The military on Wednesday said it has killed 11 militants and arrested 23 since the start of the unprecedented campaign involving tanks and helicopters.