The Israeli military said that it has reopened the Kerem Shalom crossing into Gaza – a key terminal for the entry of humanitarian aid that was closed nearly three days earlier after a Hamas rocket attack.

The attack happened over the weekend, killing four Israeli soldiers nearby.

An Israeli tank brigade seized the nearby Rafah crossing between Gaza and Egypt on Tuesday, and it remained closed.

Associated Press journalists heard sporadic explosions and gunfire in the area overnight, including two large blasts on Wednesday morning.

Rafah has been a vital conduit for humanitarian aid since the start of the war and is the only place where people can enter and exit.

Israel now controls all of Gaza’s border crossings for the first time since it withdrew troops and settlers from the territory nearly two decades ago.

Gaza’s Health Ministry says at least 46 patients and wounded people who had been scheduled to leave for medical treatment have been left stranded.

UN agencies and aid groups have ramped up humanitarian assistance in recent weeks as Israel has lifted some restrictions and opened an additional crossing in the north under pressure from the US, its closest ally.

But aid workers say the closure of Rafah, which is the only gateway for the entry of fuel for trucks and generators, could have severe repercussions.

The UN says northern Gaza is already in a state of “full-blown famine”.

The operation to capture the crossing appears to have been a limited incursion and not the start of the massive invasion of Rafah that Israel has promised.

But Israel has said it will expand the operation if ongoing indirect talks with Hamas over a cease-fire and hostage release fail to make progress.

The war began when Hamas militants breached Israel’s defences on October 7 and swept through nearby army bases and farming communities, killing some 1,200 people, mostly civilians, and abducting another 250.

Hamas is still believed to be holding around 100 hostages and the remains of more than 30 others after most of the rest were released during a November ceasefire.

The war has killed over 34,700 Palestinians, according to Gaza health officials, and has driven some 80% of Gaza’s population of 2.3 million Palestinians from their homes.

US President Joe Biden has repeatedly warned Israel’s Prime Minister Benjamin Netanyahu against launching an invasion of Rafah.

But Mr Netanyahu’s far-right coalition partners have threatened to bring down his government if he calls off an offensive or makes too many concessions in the ceasefire talks.