Gaza militants fired more than 200 rockets into Israeli towns and villages through Saturday, while Israel hit back with tank shelling and air strikes that Palestinian officials said killed a baby, her mother and a gunman.
Cross-border hostilities which broke out on Friday flared into a second day, with Gazans fleeing Israeli strikes and air-raid sirens sending Israelis running to shelters as interceptor missiles blew up Palestinian rockets in the sky.
The escalation of the conflict, which comes just ahead of both the Muslim holy month of Ramadan and Israel's Independence Day holiday, prompted Israeli Prime Minister Benjamin Netanyahu to convene a high-level meeting of his security chiefs.
Egyptian mediators, credited with brokering ceasefires in previous rounds of violence, were working to prevent further escalation of hostilities.
The latest round of violence began on Friday when a Palestinian sniper fired at Israeli troops, wounding two, according to the Israeli military.
Israel retaliated with an air strike that killed two militants from the armed Islamist group Hamas, which controls Gaza. Two other Palestinians protesting near the frontier were killed by Israeli forces on the same day, Palestinian officials said.
Hamas and Islamic Jihad began firing waves of rockets into Israel early Saturday. The Israeli military said its tanks and aircraft responded with strikes against more than 30 militant targets belonging to both groups.
Explosions shook Gaza City, where busy streets were packed with shoppers carrying out their Ramadan preparations.
The Gaza Health Ministry said a 14-month old baby and her mother were killed by one of the Israeli strikes and at least 12 other Palestinians were wounded. Residents identified two of them as militants.
"The Israeli plane fired a missile near the house and the shrapnel entered the house and hit the poor baby," said her aunt.
Islamic Jihad said in a statement that the rocket barrages were a response to Friday's events and that Israel has been delaying the implementation of previous Ibtessam Abu Arar. An Israeli military spokeswoman made no immediate comment.
A small armed pro-Hamas group in Gaza, the Protectors of Al-Aqsa, said one of its men was killed in another air strike.
The Magen David Adom ambulance service said two Israelis were wounded by shrapnel.
Israeli military spokesman Lieutenant-Colonel Jonathan Conricus said Israel was prepared to intensify its attacks. He added that Islamic Jihad was trying to destabilise the border and blamed Hamas for failing to rein it in.
Islamic Jihad said in a statement that the rocket barrages were a response to Friday's events and that Israel has been delaying the implementation of previous understandings brokered by Cairo.
In a joint statement, Hamas and Islamic Jihad said: "Our response will be broader and more painful if the enemy pursues its aggression."
Hamas said on Thursday that its Gaza chief, Yeyha Sinwar, had travelled to Cairo for talks on efforts to maintain calm along the border and alleviate hardship in the enclave.
"Egypt has stepped up its efforts with Hamas, the Islamic Jihad and Israel, but there is no conclusion yet," said a Palestinian official familiar with Cairo's mediation efforts.
The United Nations has also been part of the Cairo talks.
Although aerial exchanges are a frequent occurrence, Israel and Hamas have managed to avert all-out war for the past five years.
Israel, whose Prime Minister Netanyahu won a fifth term in office on April 9, is due to host the 2019 Eurovision song contest finals in less than two weeks in Tel Aviv, towards which long-range rockets were launched in mid-March.
Some 2 million Palestinians live in Gaza, whose economy has suffered years of blockades as well as recent foreign aid cuts. Unemployment stands at 52%, according to the World Bank, and poverty is rampant.
Israel says its blockade is necessary to stop weapons reaching Hamas, with which it has fought three wars since the group seized control of Gaza in 2007.
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