TEL AVIV, Israel — Prime Minister Benjamin Netanyahu said Tuesday that the remains of a hostage returned by Hamas overnight are body parts of another hostage who was recovered in Gaza by Israeli troops almost two years ago — an announcement that threatened to rattle the tenuous, U.S.-brokered ceasefire agreement.

Under the truce, Hamas is expected to return all Israeli hostage remains as soon as possible.

Netanyahu called the return of body parts a “clear violation” of the ceasefire agreement by the militant group. He said he will convene top security officials for an emergency discussion on Tuesday afternoon to weigh Israel’s response.

Israeli media said his likely options include halting the entry of humanitarian aid to Gaza, expanding Israeli control of Gaza or carrying out airstrike

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