Trump’s hostile rhetoric represented a shift after initially expressing nonchalance about Hamas killings, saying they had taken out “a couple of gangs that were very bad.”

Israeli Prime Minister Benjamin Netanyahu has instructed the country's security forces to take "strong action" against militant targets in the Gaza Strip, accusing Hamas of breaching the ceasefire.

"Following a ceasefire violation by Hamas, Prime Minister Netanyahu held consultations with the defence minister and senior security officials and instructed to take strong action against terrorist targets in the Gaza Strip," Netanyahu's office said in a statement.

War not over until Hamas disarms

Netanyahu warned on Saturday that the war in Gaza would not be over until Hamas was disarmed and the Palestinian territory demilitarised.

His declaration came as Hamas's armed wing, the Ezzedine Al-Qassam Brigades, handed over the remains of two further hostages on Saturday night under a US-brokered ceasefire agreement.

Netanyahu's office said late Saturday that a Red Cross team had received the remains of two hostages from Hamas and handed them to Israeli forces in Gaza, from where they would be taken to Israel to be identified.

The issue of the dead hostages still in Gaza has become a sticking point in the implementation of the first phase of the ceasefire. Israel has linked the reopening of the key Rafah crossing to the territory to the recovery of the hostages' remains.

Netanyahu cautioned that completing the ceasefire's second phase was essential to ending the war and involved the disarming of Hamas and the demilitarisation of the Gaza Strip.

"When that is successfully completed - hopefully in an easy way, but if not, in a hard way - then the war will end," he added in an appearance on right-wing Israeli Channel 14.

Hamas has so far resisted the idea and since the pause in fighting has moved to reassert its control over Gaza.

The US State Department on Saturday said it had "credible reports" that Hamas was planning an imminent attack against civilians in Gaza, warning that would be a "ceasefire violation".

"Should Hamas proceed with this attack, measures will be taken to protect the people of Gaza and preserve the integrity of the ceasefire," it said in a statement, without elaborating on the nature or target of such an attack.

Rafah crossing closed

Under the ceasefire deal brokered by US President Donald Trump, Hamas has so far released all 20 living hostages, along with the remains of nine Israelis and one Nepalese.

In exchange, Israel has released nearly 2,000 Palestinian prisoners and 135 other bodies of Palestinians since the truce came into effect on October 10.

Hamas has said it needs time and technical assistance to recover the remaining bodies, which it says are buried under Gaza's rubble.

Netanyahu's office said he had "directed that the Rafah crossing remain closed until further notice".

Deforestation in Brazil’s Amazon rainforest surges to 12-year high