Gaza officials call on Palestinians to demonstrate against Israel's occupation and that "land is not for sale," an apparent reference to leaked details of US' controversial "deal of the century."
There was no immediate retaliatory rocket fire from Gaza, or reports of injuries from either side.
Warplanes bombed "underground infrastructure" at a Hamas base in Gaza, following the first rocket fire from the territory since early May, the Israeli military said.
Wednesday's rallies were called to mark Nakba Day, what Palestinians term the catastrophe that befell them after Israel's invasion in 1948, when hundreds of thousands fled or were expelled from lands in what is now Israel.
Israel can operate with impunity in Gaza and its allies will file it under its 'right to defend' itself without anyone extending those same rights to Palestinians.
The ceasefire agreement mediated by Egypt and the United Nations comes after Israel's fatal bombardment kills at least 25 Palestinians.
Imad Mohammed Nesir, 22, was killed in the north of the blockaded enclave, Gaza's health ministry says, adding four others were wounded in the raid.
Palestinian security sources in Hamas-ruled Gaza tell AFP that the Israeli fire hit Hamas military observation posts at three locations along the frontier. No reports of Palestinian casualties.
Israeli soldiers shoot a Palestinian teenager dead during border protests, Palestinian health officials say.
Sunday's reopening comes after Israeli forces killed four Palestinians as tens of thousands protesters gathered at the Israel-Gaza fence on Saturday to mark a year since protests and clashes erupted there.
For a whole year scores of Palestinians have been killed and wounded for simply demanding their right to return home.
The Israeli army says its warplanes struck "several" targets in the Gaza Strip as a fragile truce with the territory's Hamas leaders appeared to falter. The UN says Israeli attacks on Gaza could be a crime against humanity.
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