Foreign Office chiefs expressed disappointment last night that 88 Britons were prevented from leaving Gaza via the Rafah border crossing.
They were on a list of names allowed to enter Egypt, but the gates did not open as expected.
Almost 100 Brits came through the day before.
A statement from the Foreign Office said: “This remains a complex and challenging situation and we are pushing for a reopening.”
“It is vital that the safe passage of people and humanitarian assistance can continue.”
Meanwhile, shelling continued across the Gaza Strip.
The Sun witnessed explosions and clouds of white smoke from its vantage point in Sderot, southern Israel, on Sunday.
Most of the 30,000 residents of the city, where about 40 people were killed on October 7, have fled, but some have remained.
Supermarket worker Moria Cohen, 24, said: “When it happened I had panic attacks but this is my home.”
Retired caretaker Vladimir Kreiderman, 65, sat outside his home as Hamas rockets destroyed houses on either side of him.
He said, “You are not driving me out of my house.”
There was further shelling yesterday on the Israeli-Lebanese border, where IDF troops were fighting against the Iranian-backed Hezbollah.
US intelligence fears that the Russian mercenary group Wagner – which has played an important role for Vladimir Putin in Ukraine – will send anti-aircraft missiles to Hezbollah militias in Lebanon.