Israel upped the stakes at the weekend and dramatically changed tactics, targeting big buildings in its terror campaign against Hamas.

On Saturday, at least 60 air strikes pounded Gaza, killing 10 Palestinians and wounding 22 others, including 11 children and five women, while bringing down a 12-storey high-rise block containing 44 flats.

Aircraft hit 20 so-called "terror targets" in Gaza throughout the morning, the Israeli army said.

Today, air strikes hit the seven-storey Zourab building in Rafah which houses an office of Gaza's Interior Ministry.

The building was levelled and the strikes caused severe damage to nearby shops, homes and cars.

Another strike smashed into a shopping centre in the town.

The targeting of large buildings appeared to be part of a new Israeli tactic.

Over the weekend the IDF began warning Gaza residents via automated phone calls that it would target buildings harbouring "terrorist infrastructure" and that they should stay away.

A senior military official confirmed that Israel now has a policy of striking at buildings it believes contain Hamas operational centres or those from which military activities are launched.

The official claimed each strike required prior approval from military lawyers and was carried out only after the local population was warned.

On Saturday, Prime Minister Benjamin Netanyahu threatened harsh retribution for the death of an Israeli child in a rocket strike on a kibbutz near the Gaza border on Friday.

Elsewhere, the Egyptian Foreign Ministry called on "concerned parties to accept a ceasefire of unlimited duration and to resume indirect negotiations in Cairo."

The invitation to new truce talks came after a Saturday meeting between Egyptian leader Abdel Fattah el-Sissi and Palestinian President Mahmoud Abbas.

"What interests us now is putting a stop to the bloodshed," Mr Abbas said.

"As soon as a ceasefire goes into effect, the two sides can sit down and discuss their demands."

Hamas leaders said they had committed to Mr Abbas's bid to join the International Criminal Court, which could open Israel to war crime probes.