The Palestinian National Campaign to Return the Bodies of the Martyrs says Israel still holds the bodies of some 29 Palestinians in a special cemetery for "enemy combattants" in the Jordan Valley.
Hamas earlier called for a mass turnout for the funeral of the released Awadallahs.
Hasan Yousef, a Hamas leader in the occupied West Bank, addressed the masses before the funeral prayer saying that the "resistance is the shortest way to liberate Palestine," paying homage to the Palestinian martyers.
He added: the Palestinians will not forget their murder crime and Hamas shall keep its promise to revenge it.
AFP contributed to this report.