Three senior Hamas military commanders have been killed in Israeli air strike in the Gaza Strip, the Islamist militant group said.
Hamas named the men as Mohammed Abu Shammala, Raed al-Attar and Mohammed Barhoum and said they were killed in a bombing of a house in the southern town of Rafah.
The quick breakdown of the ceasefire in Gaza is "extremely depressing," according to Foreign Secretary Philip Hammond, but he said that ending suffering remained the top priority.
He said: "Diplomacy is never dead. We have always got to keep trying but it is obviously extremely depressing that this ceasefire that we've all worked so hard to get broke down so quickly."
There have been two days of quiet in Gaza. No rockets or missiles, no more destroyed houses, no more ambulance sirens screaming.
A three-year-old girl has been rescued from Gaza and brought to London for life-saving heart surgery.
A small team of NHS doctors and surgeons is travel to Gaza to set up facilities and establish how best to use specialists and equipment.