Israel on Tuesday said it received human remains that Palestinian militants handed over to the Red Cross, but it was not immediately clear if they were one of three hostages remaining in the Gaza Strip.

The office of Prime Minister Benjamin Netanyahu said the remains will be taken for forensics testing and identification.

The handover is the latest under last month's fragile ceasefire that has held despite mutual accusations of violations.

Palestinian Islamic Jihad said it found the remains earlier this week in Nuseirat, a refugee camp in central Gaza.

Palestinian militants have returned 25 bodies of hostages under the ceasefire deal that went into effect on Oct. 10.

In return, Israel has released the bodies of 330 Palestinians to Gaza. Most remain unidentified.

Under Israeli pressure to hurry, Hamas says it has not been able to reach all remains of hostages because they are buried under rubble from Israel’s two-year offensive.

Israel has accused the militants of dragging their feet and threatened to resume military operations or withhold humanitarian aid if all remains are not returned.

Netanyahu’s office asserted that the delay in returning remains amounted to a ceasefire violation.

The remaining hostages have been two Israelis and a man from Thailand.

Production by Wafaa Shurafa