This comes after rockets were fired at southern Israeli communities in the last 24 hours, leading to a response from the IDF, which saw three killed in Gaza, including a Hamas terrorist.
At least five civilians were wounded, local medical officials said.
Israeli forces said in a statement about 150 rockets were fired from Gaza and at least 25 had been intercepted.
Three Palestinians were killed and many others severely injured on predawn Thursday due to the continuous Israeli airstrikes carried out over the besieged Gaza Strip.
Israel Hayom's Yoav Limor says Hamas doesn't want war and Israel doesn't know what it wants: Ministers who met this week are mostly leaning toward a calm, despite the fact that the way there is long and complicated, and doesn't offer much more than quiet.
Israel's military later confirmed it struck Gaza, saying it hit 12 Hamas sites in all, including "an offensive maritime terror tunnel. several terror sites in military compounds throughout the Gaza Strip. rocket manufacturing facilities and a central logistical military complex".
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A large-scale naval exercise by Iran last week in the Strait of Hormuz was a designed message to the United States, Army Gen. Navy has reported zero unsafe or unprofessional interactions with the Iranian military since August 2017.
An explosion is seen during an Israeli air strike in Gaza City August 8, 2018.
The military stressed that the "IDF is prepared for a variety of scenarios and is determined to continue its mission to protect the citizens of Israel".
Shortly after, the BBC responded to the Israeli complaints and edited the headline slightly by adding "after rockets hit Israel" without explaining the reason behind the edit.
Israel's military earlier said shots were fired from Gaza at civilians working on the barrier that separate the territory and Israel, damaging a vehicle. Israeli medics reported that four wounded people were taken to hospital.
US Envoy Jason Greenblatt who has been involved in peace negotiations between Israel and Palestine, pointed a finger squarely at Hamas for the escalation of violence.
Mladenov warned "if the current escalation, however, is not contained immediately, the situation can rapidly deteriorate with devastating consequences for all people".
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Hamas spokesman Sami Abu Zuhri blamed Israel for the escalation, citing the killing of two Hamas gunmen on Tuesday in northern Gaza which he described as unprovoked.
Hamas's military wing said it was behind the rocket attacks. Israeli media reported that army officials had later acknowledged a mistake had been made and the militants had not been firing at soldiers, though the military would not confirm that information to AFP.
Israel regularly carries out airstrike attacks in Gaza under the pretext of targeting Hamas movement sites. That was followed by the rocket fire and then the Israeli strikes.
The incident occurred while a group of senior Hamas leaders from overseas were visiting Gaza to discuss the ceasefire efforts with local leaders.
The gathering had raised hopes a deal for a lasting truce with Israel, with the backing of Egypt and the United Nations.
Gazans have held weekly protests against Israel at camps on the border since March 30, some of which have become violent.
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