Palestinian militant groups Hamas and Islamic Jihad said they would hand over the remains of a Gaza hostage at 1400 GMT on Tuesday, under the terms of the US-brokered ceasefire with Israel.

“The al-Quds Brigades and the Ezzedine al-Qassam Brigades will hand over the body of an Israeli captive found in the central Gaza Strip at 4:00 pm Gaza time (1400 GMT),” the groups said in a joint statement, referring to their armed wings.

Earlier on Tuesday, Israel said the delay in handing over a hostage body that Islamic Jihad said it had found was a “violation” of the fragile ceasefire.

The Islamic Jihad said it had located the body of a hostage on Monday during search operations in the central Gaza Strip.

A source in Islamic Jihad, who requested anonymity, confirmed the remains belonged to one of the last three hostages held by militants in the territory.

“In light of the Islamic Jihad’s announcement regarding the location of findings related to a deceased hostage, Israel views with severity the delay in their immediate transfer,” the office of Prime Minister Benjamin Netanyahu said in a statement on Tuesday.

“This constitutes a further violation of the agreement. Israel demands the immediate return of the three deceased hostages still being held in the Gaza Strip,” it added.

At the start of the US-brokered ceasefire between Israel and Hamas, which came into effect on October 10, militants were holding 20 living hostages and 28 bodies of deceased captives.

Hamas has since released all the living hostages and returned the remains of 25 dead hostages, in line with the ceasefire terms.

In exchange, Israel has released nearly 2,000 Palestinian prisoners in its custody and returned the bodies of hundreds of dead Palestinians.