The Israeli military has intensified its assault on Gaza, as Palestinian militants continue to fire rockets into Israel on the fifth day of hostilities.
Israel's army said air and ground forces were involved in attacks on Friday but had not entered Gaza.
A BBC reporter in Gaza said there was heavy shelling involving gunboats, fighter jets and helicopters.
More than 100 people have been killed in Gaza and seven in Israel since fighting began on Monday.
Meanwhile, Jewish and Israeli-Arab mobs have been fighting within Israel, prompting its president to warn of civil war.
Defence Minister Benny Gantz ordered a "massive reinforcement" of security forces to suppress the internal unrest that has seen more than 400 people arrested.
Police say IsraeliArabs have been responsible for most of the trouble and reject the accusation that they are standing by while gangs of Jewish youths target Arab homes.
In Gaza, Palestinians fearing an incursion by Israeli troops have been fleeing areas close to the border with Israel. The Israeli military said it had conducted an operation overnight to destroy a network of Hamas tunnels, but no troops had entered Gaza.
Meanwhile Hamas fired three more volleys amounting to about 55 rockets in total into Israel on Thursday evening. An 87-year-old woman died after falling on her way to a bomb shelter near Ashdod in southern Israel. Other areas including Ashkelon, Beersheba and Yavne were also targeted.
In a statement released early on Friday morning, Israeli Prime Minister Benjamin Netanyahu said the Israeli military operation against Palestinian militants in Gaza would continue for as long as necessary. He said Hamas, the Islamist group that rules Gaza, would pay a heavy price.
A Hamas military spokesman said the group was ready to teach Israel's military "harsh lessons" should it decide to go ahead with a ground incursion.
This week's violence in Gaza and Israel is the worst since 2014.
Experts have analyzed photos exclusively obtained by The Washington Post, which suggest that the explosions at a UN building in Gaza on March 19, which killed Bulgarian aid worker Marin Marinov
Israel’s Defence Minister Israel Katz has stated that the Israeli army’s presence in Gaza is part of a broader military strategy, with plans to maintain a long-term presence in established security zones not only in Gaza
At least 35 Palestinians, including children, were killed in an Israeli airstrike that targeted a multi-storey residential building in eastern Gaza City,
The Bulgarian Ministry of Foreign Affairs (MFA) has so far refrained from attributing responsibility to Israel for the death of Bulgarian humanitarian worker Marin Marinov in Gaza
A group of Members of the European Parliament (MEPs) has raised urgent concerns with the European Commission regarding the ongoing detention of Saudi political activist Abdulrahman al-Khalidi in Bulgaria
Montenegro’s Minister for European Affairs, Majda Gorgević, reaffirmed in an interview with BGNES that Chinese investments do not threaten the country’s EU aspirations
During the "EU Meets the Balkans" forum in Sofia, North Macedonia’s Deputy Foreign Minister Zoran Dimitrovski addressed ongoing concerns surrounding his country's EU accession process
European Commission President Ursula von der Leyen declared that the era of a unified West is over, stating that only Europe remains as a bastion of the values traditionally associated with the Western alliance
EU Commissioner for Enlargement Marta Kos emphasized that the expansion of the European Union remains one of the top priorities of the current European Commission
Google Street View Cars Return to Bulgaria for Major Mapping Update
Housing Prices Soar in Bulgaria’s Major Cities as Demand and Supply Strain Increase
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