Gaza’s nine-day-old ceasefire came under strain on Sunday after the Israeli army said it launched air strikes in response to attacks it claimed were carried out by Hamas against its forces.

Hamas, however, maintained it was adhering to the truce, with one official accusing Israel of devising “pretexts” to resume its own attacks.

Later, the Israeli military said in an online briefing that it launched strikes after attacks in Rafah, southern Gaza, and in the northern town of Beit Lahia, warning “there is a possibility of more strikes.”

Gaza’s civil defence agency said at least 13 people had been killed across the territory.

Israeli Prime Minister Benjamin Netanyahu earlier instructed security forces to take “strong action against terrorist targets in the Gaza Strip,” his office said in a statement, accusing Hamas of “a ceasefire violation.”

Defence Minister Israel Katz then warned that the group would “pay a heavy price for every shot and every breach of the ceasefire,” adding Israel’s response would “become increasingly severe.”

The uneasy truce in the Palestinian territory, brokered by US President Donald Trump and taking effect on 10 October, brought to a halt more than two years of devastating war between Israel and Hamas.

The deal established the outline for hostage and prisoner exchanges, and was proposed alongside an ambitious roadmap for Gaza’s future but has immediately faced challenges in implementation. 

National Security Minister and right-wing firebrand Itamar Ben Gvir urged the army to “fully resume fighting in the Strip with all force.”

A statement from Izzat Al-Rishq, a member of Hamas’s political bureau, reaffirmed the group’s commitment to the ceasefire and said Israel “continues to breach the agreement and fabricate flimsy pretexts to justify its crimes.”

Hamas’s armed wing insisted on Sunday that the group was adhering to the ceasefire agreement with Israel and had “no knowledge” of any clashes in Rafah.

Under Trump’s 20-point plan, Israeli forces have withdrawn beyond the so-called Yellow Line, leaving them in control of around half of Gaza, including the territory’s borders but not its main cities.

Hamas in turn has released 20 surviving hostages and is in the process of returning the remaining bodies of those who have died.

The war, triggered by Hamas’s October 7, 2023 resistance campaign on Israel, has killed at least 68,159 people in Gaza, according to the health ministry in the Hamas-run territory, figures the United Nations considers credible.