Israel's Operation Protective Edge enters its fourth week

Operation Protective Edge entered its fourth week on Tuesday. It is Israel's most deadly offensive since 2009, and its fourth since withdrawing from Gaza in 2005.

More than 1,100 Palestinians have been killed, mostly civilians, including 230 children.

Three civilians have been killed on Israeli soil, as well as 53 soldiers, Israel's heaviest military loss since the 2006 conflict with Lebanon's Hezbollah.

About one-tenth of Gaza's population of 1.8 million people have now sought refuge at UN-run sites.

JULY, 2014

8: Israel launches Operation Protective Edge, with air strikes on Gaza to counter rocket fire from Palestinian militants.

11: More than 100 Palestinians are killed in the operation's first four days.

13: Palestinian leader Mahmud Abbas asks the UN to put the state of Palestine under "international protection".

15: Israel accepts an Egyptian ceasefire proposal. Hamas rejects it, demanding an end to the eight-year blockade of Gaza. Israel resumes raids after the truce fails to hold.

16: Israel intensifies its bombardment, killing at least 25 Palestinians, including eight children, four of whom were on a beach.

17: Israel launches a ground operation to destroy Hamas tunnels and weapons dumps.

20: The deadliest day of the offensive, with more than 140 Palestinians killed, including at least 70 in Shejaiya, east of Gaza City, as well as 13 Israeli soldiers.

21: Fifty-five Palestinians, including 16 children, are killed in strikes and shelling across the enclave which hit a hospital and a residential building. The Palestinian toll tops 500.

22: UN chief Ban Ki-moon visits the West Bank and Israel, telling both sides: "Stop fighting, start talking". US Secretary of State John Kerry, in Cairo, urges Hamas to accept a ceasefire.

A rocket from Gaza crashes kilometres (miles) from Ben Gurion airport near Tel Aviv, prompting some airlines to suspend links with Israel for two days.

23: The UN launches an investigation into possible Israeli "war crimes" in Gaza and condemns Hamas attacks in Israel.

24: Fifteen Palestinians die when a UN-run school is hit by an Israeli shell, and the conflict threatens to spread to the West Bank and East Jerusalem.

25: Kerry and Ban press for a seven-day truce, Israel and Hamas agree to stop fighting for 12 hours.

26: The first day of calm since the operation was launched. Foreign ministers from eight countries or entities urge an extended truce. Israel accepts the proposal, Hamas does not.

27: Fighting resumes, the overall Palestinian toll tops 1,000. US President Barack Obama underscores the need for an Israeli ceasefire.

28: "The Eid of blood" marks a sombre end to the Islamic holy month of Ramadan. The UN Security Council calls for an immediate, unconditional humanitarian ceasefire. Ten Israeli soldiers are killed, and premier Benjamin Netanyahu says the country "must be prepared for a lengthy campaign".

Israel strikes the home of top Hamas leader Ismail Haniya. Two adults and eight children die inside the Shati refugee camp where Haniya lives.

29: Fighting rages in Gaza and its main power station is knocked out. Iranian Ayatollah Ali Khamenei accuses Israel of committing "genocide" in Gaza.