Hamas has raised the prospect of exchanging an Israeli soldier killed in Operation Protective Edge in return for Palestinian prisoners.
Abu Obeida, spokesman for Hamas's military arm, the Ezzedine al-Qassam Brigades, said that "the resistance has... cards in its hands that will force the enemy to release you", referring to prisoners in Israeli jail.
Israeli soldiers, dead or alive, have in the past proved valuable bargaining chips.
The bodies of two soldiers killed in the 2014 Gaza war, Oron Shaul and Hadar Goldin, are believed to be held by Hamas, which has not clarified their fate.