Israel has called up another 16,000 reserve soldiers to boost its ongoing campaign to destroy Hamas’ tunnel network in Gaza.
This latest call-up brings the number of IDF troops involved in Operation Protective Edge to 86,000.
In an interview with Israel Radio, IDF Southern Command General Sami Turjeman said rapid progress was being made.
The Israel Defence Force has initiated a four-hour ceasefire for humanitarian relief in Gaza, which began at 3pm local time.
Lt Col Peter Lerner, a spokesman for the IDF warned that if Hamas did not respect the truce, things “are going to get messier”.
A UN school in Gaza’s Jabaliya refugee camp was shelled by the Israeli military early on Tuesday morning, killing 15 and leaving a further 90 wounded, according to Gaza health officials.
The school was being used by hundreds of Palestinians as a shelter to escape the fighting, said Adnan Abu Hasna, a spokesman for the UN aid agency, UNRWA.
US President Barack Obama has demanded an immediate ceasefire in Gaza after speaking to Israeli Prime Minister Benjamin Netanyahu on Sunday evening.
Mr Obama said the ceasefire should be without any preconditions to allow humanitarian aid to reach the people of Gaza.
An Israeli soldier has been killed in Gaza on the first night of the IDF’s ground operation in the Palestinian territory.
Sergeant Eitan Barak, a 20-year-old from Hertzliya, died during the operation.
Israel said it had killed 14 terrorists overnight as it targeted Hamas’ network of tunnels in the Gaza Strip.
Israeli Prime Minister Benjamin Netanyahu has said the country will increase its assault on Hamas and terrorist organisations in Gaza.
His announcement came in a statement issued on Wednesday afternoon after another day of rocket attacks on Israel.
More than 120 rockets have been fired on Israel from the Gaza strip in the past 24 hours.
The Israeli Defence Force said it had struck more than 160 Hamas terror bases in Gaza in response, killing 20 Palestinians.
The IDF said its current ‘Protective Edge’ operation would continue until firing at Israel stops.
A long-range - probably Iranian-built - rocket was launched towards Tel Aviv from Gaza on Tuesday.
Sirens sounded in Tel Aviv as the missile was brought down south of the city by the Iron Dome defence system. Islamic Jihad claim responsibility for the attack.
Meanwhile, Gadera, Be’er Sheva and Ashkelon came under sustained rocket fire from Gaza.
Israel began a major counter-offensive against Hamas early on Tuesday morning in response to escalating rocket fire from the Gaza Strip.
The offensive, labelled Operation Protective Edge, began with air and sea strikes on at least 50 sites in Gaza, including four houses belonging to militants and 18 concealed rocket launchers.
The Israeli operation that began following the kidnapping of Naftali Frenkel, Gilad Shaer and Eyal Yifrach was scaled down this week.
The emphasis has shifted from a widespread manhunt and mass arrests of Hamas members to intelligence-gathering and more focused searches.