More than 350,000 reservists have joined the forces massed in southern Israel and awaiting orders

• Israel and Hamas at war – live updates

The double line of Israeli tanks stretched to the horizon. About 100 were visible, low-slung hulks quickly taking on the colour of the pervasive desert dust. This was just a small part of Israel’s coiled military might ranged along the borders of Gaza, waiting for the order to move. Israel has about 2,200 tanks, a massive force, 10 times the British army’s tank fleet, and many of them are here, fuelled up and pointing west.

About 20 miles (30km) to the north, near the border town of Sderot, huge self-propelled guns have been dug into the earth, angled towards Beit Hanoun and Gaza City, which lie just over the crest of a hill. Lorries and tankers carrying fuel and water run in convoys along the Israeli roads that run north to south, parallel to the Gaza border, and reservists fill the streets, cafes and petrol stations of the border towns that absorbed the brunt of the 7 October Hamas attack that ignited the current war.

Red Cross confirms release of two more Hamas hostages; Biden official says ‘we should have those hostages released and then we can talk’

• Hamas and Israel at war: what we know on day 17

The leaders of the US, UK, France, Canada, Germany and Italy have called on Israel to adhere to international law and protect civilians, while also reiterating Israel’s right to defend itself against terrorism.

In a statement put out after a phone call, the leaders’ offices said:

The leaders reiterated their support for Israel and its right to defend itself against terrorism and called for adherence to international humanitarian law, including the protection of civilians.

They welcomed the release of two hostages and called for the immediate release of all remaining hostages. They committed to close coordination to support their nationals in the region, in particular those wishing to leave Gaza.

The leaders committed to continue close diplomatic coordination, including with key partners in the region, to prevent the conflict from spreading, preserve stability in the Middle East, and work toward a political solution and durable peace.

At least 400 Palestinians killed in last 24 hours, including 70 in refugee camp and near hospitals

• Israel and Hamas at war – live updates

The blockaded Gaza Strip has been hit by one of the deadliest nights of Israeli bombing so far in the war against the Palestinian militant group Hamas, as two more hostages were freed amid reports that talks to secure the release of dozens of others were under way.

At least 400 Palestinians were killed in Gaza in the last 24 hours, according to the Hamas-run health ministry, and 70 were killed overnight on Sunday in bombardments of the densely populated Jabalia refugee camp and streets close to two hospitals in Gaza City.

Families given glimmer of hope by release of two US citizens, but fear time is running out before ground invasion

• Israel-Hamas war: latest updates

Pressure has intensified on Israel to negotiate the release of more than 200 people held by Palestinian militants in Gaza, with desperate families begging officials to help free their loved ones before an anticipated ground invasion.

An Israeli military spokesperson announced on Sunday that more than 212 people were held in Gaza, as officials worked to identify and locate those missing after a deadly incursion by Hamas on 7 October.

Israel says anyone in northern Gaza will be considered ‘an accomplice in a terrorist organisation’

• Israel-Hamas war: latest updates

Israel has said it is intensifying attacks on northern Gaza and warned that anyone who stayed risked being considered as “an accomplice in a terrorist organisation”, as airstrikes continued on Sunday in the south, where civilians had fled hoping to survive the war.

A second trickle of aid was allowed into Gaza from Egypt on Sunday, but the head of the World Food Programme (WFP) warned that the humanitarian situation was now catastrophic for the 2.3 million people trapped inside the territory.

Noam Alon, whose partner Inbar Haiman was abducted by Hamas in the October 7 attack in Israel, is calling on international leaders to make the safe return of hostages their priority

• Israel-Hamas war – live updates

Two weeks on, Noam Alon still isn’t ready to watch the video that shows his girlfriend, Inbar Haiman, being dragged towards Gaza as a hostage.

“My parents prefer that I don’t see it,” says the 24-year-old art student. “They’ve described every bit of it to me – and they haven’t made it any better or worse than it really is – but I still haven’t watched it. I don’t want it scarred in my mind. I’m trying to keep my mind as positive as I can and to do everything I can to bring her back.”