Al-Hayat al-Jadida, al-Quds and al-Ayyam said that Moath Ziad al-Sory, 15, from al-Nusseirat in the central Gaza Strip, was injured after he was shot in the stomach by Israeli soldiers during Gaza border protests last Friday. A number of Palestinians "infiltrated" Israel and threw firebombs and "an explosive device" before returning to Gaza, it said. The decision to build the sea barrier was prompted by an incident during the 2014 Israeli-Gaza conflict, when Hamas fighters managed to enter Israeli territory by sea. Yaghi and Suri were buried on Saturday.
Dozens of Palestinians have been killed by Israeli army fire.
Palestinians have also flown balloons and kites carrying incendiary devices across the border, starting hundreds of fires inside Israel.
In a statement, a military spokesperson said the airstrike targeted a squad "that was launching arson balloons from the northern Gaza Strip into Israel".
The Egyptian official said Cairo would not let its facilities or territory in the Sinai desert, bordering Gaza, be used to relieve Israel of keeping the Palestinian economy alive.
Palestinian protesters gather as tear gas canisters are launched by Israeli forces during a demonstration along the border between Israel and the Gaza strip, east of Gaza city in August 2018.
Dead fetus found toilet on American Airlines plane at LaGuardia
The body of a fetus was found in a jetliner's toilet Tuesday by an American Airlines cleaning crew, authorities said. An attendant noticed a large amount of toilet paper in one of the plane's lavatory toilets.
The Fatah movement of Palestinian President Mahmoud Abbas, who holds sway in the Israeli-occupied West Bank, earlier said any deal risked ending hopes of achieving Palestinian statehood. Israel also demands the release of a prisoner said to have mental health issues, thought to be a hostage of Hamas.
Israel and the United States designate Hamas as a terrorist organisation.
More than two million Palestinians are packed into the Gaza Strip, which suffers deep economic hardship.
The official statement after the meeting declared the military to be ready for "any scenario", but provided no indication that Israel was either favoring the ceasefire deal or the alternative, with Transportation Minister Israel Katz said was war.
Similar attempts by activists to challenge the Israeli naval blockade of Gaza have been blocked before.