Palestinians clashed with Israeli forces in the occupied West Bank on Wednesday during demonstrations to mark 65 years since what they call the Nakba (Catastrophe) when the creation of Israel’s caused many to lose their homes and become refugees.

A shell fired from Gaza, which is ruled by the Islamist movement Hamas, exploded in an open area of Israel but caused no injuries, according to an Israeli military spokesman. There was no immediate claim of responsibility.

U.S. Secretary of State John Kerry is to return to the region on Tuesday in another bid to revive peace talks frozen since 2010.

But a resolution remains elusive and many Palestinians want refugees and their descendants to return to lands now in Israel – an idea Israel rejects, saying it would spell the end of the Jewish state.

Protesters skirmished with Israeli forces outside a refugee camp near the West Bank city of Hebron and at a prison near Ramallah. Several Palestinians were injured.

Israeli police in Jerusalem scuffled with Palestinian protesters, tossing stun grenades and making several arrests.

Thousands also rallied in the main square of Ramallah, the Palestinian de facto capital while Jerusalem remains under Israeli control, holding up placards with the names of villages depopulated in 1948 and old keys, symbols of lost homes.

“For the sake of my future and to return to my family’s land, I don’t want any more useless negotiations but the path of resistance and the rifle,” said Ahmed al-Bedu, a gangly 15-year-old Palestinian who holds Jordanian citizenship.

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