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. A Bedouin source, who requested anonymity because of the sensitivity of the subject, said the militants behind Manazil’s kidnapping accused him and several other men of planting a booby trap to assassinate Ouda Bereikat.