Witnesses said the Saturday incident might have been caused by an old bomb planted in the area.
Medical sources in Gaza said the children, aged four to 10, were from the same family.
The Saturday explosion in Gaza comes a few weeks after Israeli tanks and bulldozers carried out an incursion into Deir al-Balah, located about 14 kilometers (8.5 miles) south of Gaza City, on June 17, injuring a Palestinian. Israeli bulldozers also destroyed agricultural land in the city.
The Tel Aviv regime conducts airstrikes and ground attacks against the Gaza Strip on an almost regular basis.
Over a dozen Palestinians were killed in the airstrikes carried out by the Israeli regime on the besieged Palestinian territory during the six-day period of June 18-23.
In addition to airstrikes and ground attacks, the Tel Aviv regime also denies about 1.7 million people in Gaza their basic rights, including the freedom of movement and the right to decent living, work, health and education.
On June 13, US President Barack Obama awarded the Presidential Medal of Freedom to Israeli President Shimon Peres, the man who has overseen the killing of Palestinian women and children by Israeli forces in the occupied territories for decades.
Obama awarded the 88-year-old criminal the highest civilian honor in the United States during a dinner ceremony in the White House.
HSN/PKH/IS
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